Note 17 - Other Comprehensive Income (Loss) - Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Reclassification adjustment for net (gains) losses included in net income									$ (1,227)	$ 4
Income tax expense	$ 744	$ 513	$ 514	$ 555	$ 1,749	$ 388	$ 508	$ 426	2,326	3,071
Net of tax amount									969	(3)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification adjustment for net (gains) losses included in net income									(1,227)	4
Income tax expense									258	(1)
Net of tax amount									$ (969)	$ 3