Note 16 - Stock Incentive Plans - Share-based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Total compensation cost for share-based payments	$ 1,757	$ 1,509
Weighted average grant-date fair value of equity instruments granted (in dollars per share)	$ 0.97	$ 1.73
Total fair value of shares vested during the period	$ 1,534	$ 2,455
Unamortized share-based payments	$ 1,438	$ 1,784
Weighted average period to be recognized as expense (Year)	1 year 21 days	1 year 222 days