Note 12 - Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Accumulated other comprehensive income (loss)	$ (659)	$ (254)	$ (254)
Other comprehensive income (loss), net of tax	256	1,446	(405)
Accumulated other comprehensive income (loss)	(403)	1,192	(659)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Accumulated other comprehensive income (loss)	(659)	1,142	1,142
Other comprehensive income (loss), net of tax	256	50
Accumulated other comprehensive income (loss)	$ (403)	1,192	(659)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated other comprehensive income (loss)		(1,396)	$ (1,396)
Other comprehensive income (loss), net of tax		1,396
Accumulated other comprehensive income (loss)