Note 14 - Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Balance at Beginning of Year	$ 179,935	$ 113,559	$ 112,449
Other Comprehensive Income (Loss)	(1,825)	957	(1,541)
Reclassify Stranded Tax Effects
Balance at End of Year	260,058	179,935	113,559
AOCI Attributable to Parent [Member]
Balance at Beginning of Year	(1,644)	(2,330)	(789)
Other Comprehensive Income (Loss) Before Reclassifications - Net of Tax	(1,831)	937
Reclassification Adjustment for Gains (Losses) Realized - Net of Tax	6	20
Other Comprehensive Income (Loss)	(1,825)	957	(1,541)
Reclassify Stranded Tax Effects		(271)
Balance at End of Year	$ (3,469)	$ (1,644)	$ (2,330)