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Note 8 - Comprehensive Income (Loss) - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Balance, beginning of period $ 5,310    
Net other comprehensive income (loss) 2,166 $ (1,092) $ 242
Balance, end of period 7,476 5,310  
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]      
Balance, beginning of period 5,310 6,402  
Other comprehensive income before reclassifications 2,269 (962)  
Amounts reclassified from accumulated other comprehensive income, net of tax benefit (103) (130)  
Net other comprehensive income (loss) 2,166 (1,092)  
Balance, end of period $ 7,476 $ 5,310 $ 6,402