Note 12 - Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Balances of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Balance	$ 251,157	$ 245,879
Balance	249,272	245,312
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Balance	45	(1,046)
Other comprehensive income (loss) before reclassifications	(621)	552
Amounts reclassified from accumulated other comprehensive income (loss)	1	18
Net current period other comprehensive income (loss)	(620)	570
Balance	(575)	(476)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Balance	49	(68)
Other comprehensive income (loss) before reclassifications	177	181
Amounts reclassified from accumulated other comprehensive income (loss)		(64)
Net current period other comprehensive income (loss)	177	117
Balance	226	49
AOCI Attributable to Parent [Member]
Balance	94	(1,114)
Other comprehensive income (loss) before reclassifications	(444)	733
Amounts reclassified from accumulated other comprehensive income (loss)	1	(46)
Net current period other comprehensive income (loss)	(443)	687
Balance	$ (349)	$ (427)