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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, 2017	Dec. 31, 2016	Dec. 31, 2015
Net income/(loss)	$ (14,172)	$ 2,444	$ 6,776
Basic weighted average shares outstanding (in shares)	8,576,588	9,021,980	9,127,385
Dilutive common stock equivalents using treasury stock method (in shares)		284,054	467,274
Diluted weighted average shares outstanding (in shares)	8,576,588	9,306,034	9,594,659
Basic earnings per common share: (in dollars per share)	$ (1.65)	$ 0.27	$ 0.74
Diluted earnings per common share: (in dollars per share)	$ (1.65)	$ 0.26	$ 0.71
Weighted average options outstanding (in shares)	815,870	885,163	1,053,785
Anti-dilutive options not included in the computation (in shares)	815,870	323,644	177,125

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