Note 12 - Stock Incentive Plans - Share-based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Total compensation cost for share-based payments	$ (9)	$ 325	$ 489	$ 567
Weighted average grant-date fair value of equity instruments granted (per share) (in dollars per share)	$ 0.53	$ 1.75	$ 0.53	$ 1.76
Total fair value of shares vested during the period	$ 436		$ 1,427	$ 1,524
Unamortized share-based payments			$ 293	$ 1,315
Weighted average period to be recognized as expense (Year)			328 days	1 year 109 days