Note 7 - Derivatives and Hedging Activities - Changes in Fair Values of Derivative Financial Instruments (Details) - Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Unrealized loss at beginning of period, net of tax	$ (3,915)	$ (1,276)
Amount of loss recognized in other comprehensive income, net of tax	(5,406)	(3,061)
Unrealized loss at end of period, net of tax	(7,632)	(3,915)
Unhedging Caplet
Amount reclassified from accumulated other comprehensive income	513
Swap
Amount reclassified from accumulated other comprehensive income	625
Caplet Amortization
Amount reclassified from accumulated other comprehensive income	$ 551	$ 422