Note 14 - Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Balance at Beginning of Year	$ 260,058	$ 179,935	$ 113,559
Other Comprehensive Income (Loss)	6,082	(1,825)	957
Balance at End of Year	285,097	260,058	179,935
AOCI Attributable to Parent [Member]
Balance at Beginning of Year	(3,469)	(1,644)	(2,330)
Other Comprehensive Income (Loss) Before Reclassifications - Net of Tax	5,998	(1,831)
Reclassification Adjustment for Gains (Losses) Realized - Net of Tax	84	6
Other Comprehensive Income (Loss)	6,082	(1,825)	957
Balance at End of Year	$ 2,613	$ (3,469)	$ (1,644)