Quarterly report pursuant to Section 13 or 15(d)

Note 8 - Supplemental Equity and Accumulated Other Comprehensive Income (Loss) (Details Textual)

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Note 8 - Supplemental Equity and Accumulated Other Comprehensive Income (Loss) (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2018
Jul. 01, 2018
Jun. 30, 2018
Common Stock, Dividends, Per Share, Declared $ 0.32 $ 0.32 $ 0.64 $ 0.64            
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent     $ 0 $ 0            
Stockholders' Equity Attributable to Parent, Ending Balance $ 1,323,348 $ 1,096,425 1,323,348 1,096,425   $ 1,174,224 $ 1,165,589 $ 1,109,469   $ 1,079,061
Cumulative Effect of New Accounting Principle in Period of Adoption             (879)     594
Interest Expense, Total 4,872 5,759 10,094 10,997            
Income Tax Expense (Benefit), Total 30,704 4,211 34,111 4,394            
Deferred Income Tax Expense (Benefit), Total     (2,640) (1,216)            
AOCI Attributable to Parent [Member]                    
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent [1]     (629)              
Stockholders' Equity Attributable to Parent, Ending Balance $ (78,352) [1],[2] $ (83,011) [1] (78,352) [1],[2] $ (83,011) [1]   $ (91,627) $ (83,521) $ (70,632)   (44,814)
Cumulative Effect of New Accounting Principle in Period of Adoption                   $ (24,682)
AOCI Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]                    
Interest Expense, Total     821              
Income Tax Expense (Benefit), Total     $ (192)              
Accounting Standards Update 2016-01 [Member] | AOCI Attributable to Parent [Member]                    
Cumulative Effect of New Accounting Principle in Period of Adoption                 $ (24,682)  
Accounting Standards Update 2018-02 [Member] | AOCI Attributable to Parent [Member]                    
Cumulative Effect of New Accounting Principle in Period of Adoption                 $ (24,682)  
Forecast [Member]                    
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent         $ 3,842          
Stockholders' Equity Attributable to Parent, Ending Balance         $ (8,633)          
[1] The Company reclassified ($821) to interest expense and a related tax benefit tax of $192 during the six months ended December 31, 2019. The Company had deferred tax benefits of $2,640 and $1,216 included in the accumulated other comprehensive income loss as of December 31, 2019 and December 31, 2018, respectively.
[2] The gain (loss) on the interest rate swap will be reclassified into interest expense as payments on the derivative agreement are made. Approximately ($3,842) of the ($8,633) will be reclassified into earnings in the 12 months subsequent to December 31, 2019.