Note 12 - Other Comprehensive Income - Changes in Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Balance	$ 97,219	$ 89,191
Amount reclassified from accumulated other comprehensive income (loss)		0
Total other comprehensive income (loss)	3,551	(3,932)
Reclassification from Accumulated Other Comprehensive Income to Retained Earnings
Balance	123,782	86,738
AOCI Attributable to Parent [Member]
Balance	(4,540)	(1,745)
Other comprehensive income (loss) before reclassifications	3,677	(3,932)
Amount reclassified from accumulated other comprehensive income (loss)	(126)
Total other comprehensive income (loss)	3,551	(3,932)
Reclassification from Accumulated Other Comprehensive Income to Retained Earnings		65
Balance	$ (989)	$ (5,612)