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Note 13 - Shares Outstanding and Earnings Per Share - Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Weighted average shares outstanding - basic (in shares) 11,221 11,219 11,216 11,182 11,173 11,203 11,201 11,195 11,210 11,192 11,120
Assumed exercise of stock options and issuance of stock awards (in shares)                
Weighted average diluted shares outstanding (in shares) 11,221 11,219 11,216 11,182 11,173 11,203 11,201 11,195 11,210 11,192 11,120
Net income (loss) $ (2,104) $ (1,757) $ 3,550 $ (767) $ (4,988) $ (598) $ (22,260) $ 1,069 $ (1,078) $ (26,777) $ (19,064)
Basic net income (loss) per share (in dollars per share) $ (0.19) $ (0.16) $ 0.32 $ (0.07) $ (0.45) $ (0.05) $ (1.99) $ 0.10 $ (0.10) $ (2.39) $ (1.71)
Diluted net income (loss) per share (in dollars per share) $ (0.19) $ (0.16) $ 0.32 $ (0.07) $ (0.45) $ (0.05) $ (1.99) $ 0.10 $ (0.10) $ (2.39) $ (1.71)
Anti-dilutive securities outstanding (in shares)                 167 125 118