Quarterly report pursuant to Section 13 or 15(d)

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

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Note 7 - Supplemental Equity and Accumulated Other Comprehensive Income (Loss) - Consolidated Changes in Equity (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Balance (in shares) 38,453,046      
Balance $ 1,381,192 $ 1,165,589    
Net earnings 33,395 14,398 $ 33,395 $ 14,398
Other comprehensive income $ 14,057 $ (8,106)    
Common stock issued for exercise of options (in shares) 116,816 93,596    
Common stock issued for exercise of options $ 13,728 $ 7,855    
Common stock issued for restricted stock awards (4,890) (1,926)    
Cash dividends (12,336) (12,169)    
Stock-based compensation expense 12,667 8,267    
Common stock issued to employee stock purchase plan 1,463 1,096    
Employee stock purchase plan expense $ 286 99    
Balance (in shares) 38,601,131   38,601,131  
Balance $ 1,439,285 1,174,224 $ 1,439,285 $ 1,174,224
Cumulative Effect, Period of Adoption, Adjustment [Member]        
Balance $ (276) $ (879)    
Common Stock [Member]        
Balance (in shares) 38,453,000 37,934,000    
Balance $ 385 $ 379    
Common stock issued for exercise of options (in shares) 117,000 94,000    
Common stock issued for exercise of options $ 1 $ 1    
Common stock issued for restricted stock awards (in shares) 25,000 50,000    
Common stock issued for restricted stock awards $ 0 $ 0    
Common stock issued to employee stock purchase plan (in shares) 6,000 6,000    
Common stock issued to employee stock purchase plan $ 0 $ 0    
Balance (in shares) 38,601,000 37,803,000 38,601,000 37,803,000
Balance $ 386 $ 381 $ 386 $ 381
Additional Paid-in Capital [Member]        
Balance 420,536 316,797    
Common stock issued for exercise of options 13,727 7,854    
Stock-based compensation expense 12,667 8,267    
Common stock issued to employee stock purchase plan 1,463 1,096    
Employee stock purchase plan expense 286 99    
Balance 448,679 334,112 448,679 334,112
Retained Earnings [Member]        
Balance 1,057,470 931,934    
Net earnings 33,395 14,398    
Common stock issued for restricted stock awards (4,890) (1,926)    
Cash dividends (12,336) (12,169)    
Balance 1,073,362 931,358 1,073,362 931,358
Retained Earnings [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]        
Balance (276) (879)    
AOCI Attributable to Parent [Member]        
Balance (97,199) (83,521)    
Balance $ (83,142) $ (91,627) $ (83,142) $ (91,627)