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Note 1 - Business Description, Basis of Presentation and Significant Accounting Policies - Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Net loss	$ (16,687)	$ (14,172)
Basic weighted average shares outstanding (in shares)	8,942,629	8,576,588
Dilutive common stock equivalents using treasury stock method (in shares)
Diluted weighted average shares outstanding (in shares)	8,942,629	8,576,588
Basic loss per common share: (in dollars per share)	$ (1.87)	$ (1.65)
Diluted loss per common share: (in dollars per share)	$ (1.87)	$ (1.65)
Weighted average options outstanding (in shares)	713,331	815,870
Anti-dilutive options not included in the computation (in shares)	713,331	815,870

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