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Note 10 - Other Comprehensive Income (Details) - Changes in Each Component of Accumulated Other Comprehensive Income (Loss) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at Beginning of Period $ 3,280 $ (502) $ 2,647 $ (3,319)
Three Months Ended June 30, 2014        
Other comprehensive income before reclassifications (134) 2,341 1,797 5,163
Amounts reclassified from accumulated other comprehensive income   (1) (1,298) (6)
Net other comprehensive income during period (134) 2,340 499 5,157
Balance at End of Period 3,146 1,838 3,146 1,838
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at Beginning of Period 3,280 (502) 2,647 (3,319)
Three Months Ended June 30, 2014        
Other comprehensive income before reclassifications (134) 2,341 1,797 5,163
Amounts reclassified from accumulated other comprehensive income   (1) (1,298) (6)
Net other comprehensive income during period (134) 2,340 499 5,157
Balance at End of Period $ 3,146 $ 1,838 $ 3,146 $ 1,838