Note 5 - Derivative Instruments and Hedging Activities - Movement in AOCI Balance (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
AOCI balance, Gains and losses on cash flow hedges	$ 625
AOCI balance, Tax impact	(152)
AOCI balance	473
Other comprehensive income (loss) before reclassifications, Gains and losses on cash flow hedges	(1,615)
Other comprehensive income (loss) before reclassifications, Tax impact	381
Other comprehensive income (loss) before reclassifications	(1,234)	$ 549
Amount reclassified from AOCI, Gains and losses on cash flow hedges	58
Amount reclassified from AOCI, Tax impact	(15)
Amount reclassified from AOCI	43	$ 61
Other comprehensive income (loss), Gains and losses on cash flow hedges	(1,557)
Other comprehensive income (loss), Tax impact	366
Other comprehensive income (loss)	(1,191)
AOCI balance, Gains and losses on cash flow hedges	(932)
AOCI balance, Tax impact	214
AOCI balance	$ (718)