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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 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]        
Balance at Beginning of Period $ 5,383 $ 3,146 $ 1,041 $ 2,647
Other comprehensive (loss) income before reclassifications (907) 2,107 4,110 1,995
Amounts reclassified from accumulated other comprehensive income (1) (36) (674) (1,334)
Net other comprehensive (loss) income during period (906) 2,071 3,436 661
Balance at End of Period 4,477 5,217 4,477 5,217
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]        
Balance at Beginning of Period (6,707) (850)
Other comprehensive (loss) income before reclassifications 1,756 (3,976) (5,478) (2,067)
Amounts reclassified from accumulated other comprehensive income 466 911
Net other comprehensive (loss) income during period 1,290 (3,976) (4,567) (2,067)
Balance at End of Period (5,417) (3,976) (5,417) (3,976)
Balance at Beginning of Period (1,324) 3,146 191 2,647
Other comprehensive (loss) income before reclassifications 849 (1,869) (1,368) (72)
Amounts reclassified from accumulated other comprehensive income 465 (36) 237 (1,334)
Net other comprehensive (loss) income during period 384 (1,905) (1,131) (1,406)
Balance at End of Period $ (940) $ 1,241 $ (940) $ 1,241