Note 11 - Other Comprehensive Income - Changes in Each Component of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Balance at Beginning of Period	$ 1,041	$ 2,647
Other comprehensive income (loss) before reclassifications	3,578	1,931
Amounts reclassified from accumulated other comprehensive income	(374)	(1,298)
Other comprehensive income (loss), net of tax	3,204	633
Balance at End of Period	4,245	$ 3,280
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Balance at Beginning of Period	(850)
Other comprehensive income (loss) before reclassifications	$ (4,442)
Amounts reclassified from accumulated other comprehensive income
Other comprehensive income (loss), net of tax	$ (4,442)
Balance at End of Period	(5,292)
Balance at Beginning of Period	191	$ 2,647
Other comprehensive income (loss) before reclassifications	(864)	1,931
Amounts reclassified from accumulated other comprehensive income	(374)	(1,298)
Other comprehensive income (loss), net of tax	(1,238)	633
Balance at End of Period	$ (1,047)	$ 3,280