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Note 11 - Other Comprehensive Income - Changes in Each Component of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]        
Balance at Beginning of Period $ 4,245 $ 3,280 $ 1,041 $ 2,647
Other comprehensive income (loss) before reclassifications 1,437 (2,043) 5,015 (112)
Amounts reclassified from accumulated other comprehensive income (299) (673) (1,298)
Net other comprehensive income (loss) during period 1,138 (2,043) 4,342 (1,410)
Balance at End of Period 5,383 1,237 5,383 1,237
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]        
Balance at Beginning of Period (5,292) (850)
Other comprehensive income (loss) before reclassifications (1,860) 1,909 (6,302) 1,909
Amounts reclassified from accumulated other comprehensive income 445 445
Net other comprehensive income (loss) during period (1,415) 1,909 (5,857) 1,909
Balance at End of Period (6,707) 1,909 (6,707) 1,909
Balance at Beginning of Period (1,047) 3,280 191 2,647
Other comprehensive income (loss) before reclassifications (423) (134) (1,287) 1,797
Amounts reclassified from accumulated other comprehensive income 146 (228) (1,298)
Net other comprehensive income (loss) during period (277) (134) (1,515) 499
Balance at End of Period $ (1,324) $ 3,146 $ (1,324) $ 3,146