Note 12 - Stock Incentive Plans - Share-based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Total compensation cost for share-based payments	$ 500	$ 277	$ 1,218	$ 766
Weighted average grant-date fair value of equity instruments granted (per share) (in dollars per share)	$ 0	$ 1.71	$ 2.41	$ 1.02
Total fair value of shares vested during the period	$ 0	$ 0	$ 1,618	$ 1,427
Unamortized share-based payments			$ 2,326	$ 971
Weighted average period to be recognized as expense (Year)			1 year 10 months 24 days	1 year 9 months 18 days