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Note 10 - Comprehensive Income (Loss) - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Balance, beginning of period $ 7,444    
Net other comprehensive income (loss)   $ (32) $ 2,166
Balance, end of period 7,444  
Cumulative effect adjustment – ASU 2016-01 (7,444)    
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]      
Balance, beginning of period 7,444 7,476  
Other comprehensive income before reclassifications   2,001  
Amounts reclassified from accumulated other comprehensive income, net of tax benefit   (2,033)  
Net other comprehensive income (loss) (7,444) (32)  
Balance, end of period $ 7,444 $ 7,476