Quarterly report pursuant to Section 13 or 15(d)

Note 7 - Supplemental Equity and Accumulated Other Comprehensive Income (Loss) - Consolidated Changes in Equity (Details)

Note 7 - Supplemental Equity and Accumulated Other Comprehensive Income (Loss) - Consolidated Changes in Equity (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Mar. 31, 2019	Mar. 31, 2018
Balance (in shares)			37,607,500				37,607,500
Balance	$ 1,096,425	$ 1,109,469	$ 1,079,061	$ 997,819	$ 960,082	$ 949,627	$ 1,079,061	$ 949,627
Cumulative effect adjustments due to adoption of new accounting standards			98				98
Net earnings	44,654	17,556	17,403	19,738	48,847	15,863	79,612	84,449
Other comprehensive income (loss)	3,378	(12,379)	(1,136)	40,956	(7,058)	(824)	$ (10,137)	$ 33,073
Share repurchases		(15,404)
Surrender and retirement of stock to exercise options						0
Common stock issued for exercise of options (in shares)							263,995	139,602
Common stock issued for exercise of options	7,337	2,408	15,611	6,273	2,893	3,051
Common stock issued for restricted stock awards			(1,909)			(227)
Cash dividends	(12,086)	(12,086)	(12,066)	(11,992)	(11,988)	(11,958)
Stock-based compensation expense	5,640	6,784	11,327	4,669	4,985	3,718
Common stock issued to employee stock purchase plan	834		842	752		755
Employee stock purchase plan expense	$ 84	77	238	78	59	77
Balance (in shares)	37,813,367						37,813,367
Balance	$ 1,146,266	$ 1,096,425	$ 1,109,469	$ 1,058,292	$ 997,819	$ 960,082	$ 1,146,266	$ 1,058,292
Common Stock [Member]
Balance (in shares)	37,735,000	37,803,000	37,608,000	37,470,000	37,409,000	37,356,000	37,608,000	37,356,000
Balance	$ 377	$ 378	$ 376	$ 375	$ 374	$ 374	$ 376	$ 374
Cumulative effect adjustments due to adoption of new accounting standards
Net earnings
Other comprehensive income (loss)
Share repurchases		(1)
Surrender and retirement of stock to exercise options
Common stock issued for exercise of options (in shares)	73,000	24,000	166,000	68,000	38,000	33,000
Common stock issued for exercise of options	$ 1	$ 0	$ 2		$ 1	$ 0
Common stock issued for restricted stock awards (in shares)	1,000	3,000	24,000		22,000	13,000
Common stock issued for restricted stock awards	$ 0	$ 0	$ 0		$ 0	$ 0
Cash dividends
Stock-based compensation expense
Common stock issued to employee stock purchase plan (in shares)	4,000	0	5,000	7,000		7,000
Common stock issued to employee stock purchase plan	$ 0	$ 0	$ 0			$ 0
Employee stock purchase plan expense
Share repurchases (in shares)		(95,000)
Balance (in shares)	37,813,000	37,735,000	37,803,000	37,545,000	37,470,000	37,409,000	37,813,000	37,545,000
Balance	$ 378	$ 377	$ 378	$ 375	$ 375	$ 374	$ 378	$ 375
Additional Paid-in Capital [Member]
Balance	283,854	274,584	246,568	214,697	206,762	199,161	246,568	199,161
Cumulative effect adjustments due to adoption of new accounting standards
Net earnings
Other comprehensive income (loss)
Share repurchases
Surrender and retirement of stock to exercise options
Common stock issued for exercise of options	7,336	2,408	15,609	6,273	2,892	3,051
Common stock issued for restricted stock awards
Cash dividends
Stock-based compensation expense	5,640	6,784	11,327	4,669	4,985	3,718
Common stock issued to employee stock purchase plan	834		842	752		755
Employee stock purchase plan expense	84	77	238	78	59	77
Balance	297,748	283,854	274,584	226,469	214,697	206,762	297,748	226,469
Retained Earnings [Member]
Balance	895,205	905,139	876,931	839,564	802,705	799,027	876,931	799,027
Cumulative effect adjustments due to adoption of new accounting standards			24,780				24,780
Net earnings	44,654	17,556	17,403	19,738	48,847	15,863
Other comprehensive income (loss)
Share repurchases		(15,404)
Surrender and retirement of stock to exercise options
Common stock issued for exercise of options
Common stock issued for restricted stock awards		0	(1,909)		0	(227)
Cash dividends	(12,086)	(12,086)	(12,066)	(11,992)	(11,988)	(11,958)
Stock-based compensation expense
Common stock issued to employee stock purchase plan
Employee stock purchase plan expense
Balance	927,773	895,205	905,139	847,310	839,564	802,705	927,773	847,310
AOCI Attributable to Parent [Member]
Balance	(83,011)	(70,632)	(44,814)	(56,817)	(49,759)	(48,935)	(44,814)	(48,935)
Cumulative effect adjustments due to adoption of new accounting standards			(24,682)				(24,682)
Net earnings
Other comprehensive income (loss)	3,378	(12,379)	(1,136)	40,956	(7,058)	(824)
Share repurchases
Surrender and retirement of stock to exercise options
Common stock issued for exercise of options
Common stock issued for restricted stock awards
Cash dividends
Stock-based compensation expense
Common stock issued to employee stock purchase plan
Employee stock purchase plan expense
Balance	$ (79,633)	$ (83,011)	$ (70,632)	$ (15,862)	$ (56,817)	$ (49,759)	$ (79,633)	$ (15,862)