Note 13 - Loss Per Common Share - Calculation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Net loss	$ (3,003)	$ (3,261)
Basic and diluted weighted average number of shares outstanding (in shares)	28,583,600	28,488,032
Basic and diluted loss per common share (in dollars per share)	$ (0.11)	$ (0.11)