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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		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net loss	$ (10,142)	$ (9,276)	$ (14,151)	$ (10,564)
Basic weighted average shares outstanding (in shares)	8,306,707	8,520,041	8,304,974	8,641,173
Dilutive common stock equivalents using treasury stock method (in shares)
Diluted weighted average shares outstanding (in shares)	8,306,707	8,520,041	8,304,974	8,641,173
Basic loss per common share (in dollars per share)	$ (1.22)	$ (1.09)	$ (1.70)	$ (1.22)
Diluted loss per common share (in dollars per share)	$ (1.22)	$ (1.09)	$ (1.70)	$ (1.22)
Weighted average options outstanding (in shares)	711,888	782,012	727,980	832,953
Anti-dilutive options not included in the computations (in shares)	711,888	782,012	727,980	832,953

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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