Note 12 - Stock Incentive Plans - Share-based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Total compensation cost for share-based payments	$ 309	$ 498
Weighted average grant-date fair value of equity instruments granted (per share) (in dollars per share)
Total fair value of shares vested during the period	$ 1,248	$ 991
Unamortized share-based payments	$ 799	$ 947
Weighted average period to be recognized as expense (Year)	1 year 292 days	1 year