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Note 1 - Management Statement (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Income Tax Expense (Benefit), Total $ 3,928 $ 2,874 $ 28,599 $ 10,311
Retained Earnings [Member] | Accounting Standards Update 2018-02 [Member]        
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent $ 17,200      
Accounting Standards Update 2016-09 [Member]        
Income Tax Expense (Benefit), Total       $ (600)