Note 3 - Earnings (Loss) Per Share - Computation of Basic and Diluted Earnings per Common Share (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
Net loss	$ (2,098)	$ (2,163)	$ (4,447)	$ (4,009)
Basic weighted average shares outstanding (in shares)	16,630,770	8,301,094	16,630,684	8,304,093
Dilutive common stock equivalents using treasury stock method (in shares)
Diluted weighted average shares outstanding (in shares)	16,630,770	8,301,094	16,630,684	8,304,093
Basic loss per common share (in dollars per share)	$ (0.13)	$ (0.26)	$ (0.27)	$ (0.48)
Diluted loss per common share (in dollars per share)	$ (0.13)	$ (0.26)	$ (0.27)	$ (0.48)
Weighted average options outstanding (in shares)	569,997	724,373	578,543	736,160
Anti-dilutive options not included in the computations (in shares)	569,997	724,373	578,543	736,160