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Note 8 - Comprehensive Income (Loss) - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Balance, beginning of period $ 7,476    
Net other comprehensive income (loss) (32) $ 2,166 $ (1,092)
Balance, end of period 7,444 7,476  
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]      
Balance, beginning of period 7,476 5,310  
Other comprehensive income before reclassifications 2,001 2,269  
Amounts reclassified from accumulated other comprehensive income, net of tax benefit (2,033) (103)  
Net other comprehensive income (loss) (32) 2,166  
Balance, end of period $ 7,444 $ 7,476 $ 5,310