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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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Weighted average basic shares outstanding (in shares) 11,389 11,386 11,383 11,369 11,221 11,219 11,216 11,182 11,381 11,210 11,192
Assumed exercise of stock options and issuance of stock awards (in shares)                
Weighted average diluted shares outstanding (in shares) 11,391 11,386 11,390 11,369 11,221 11,219 11,216 11,182 11,381 11,210 11,192
Net income (loss) $ 4,187 [1] $ 2,280 [1] $ 4,797 [1] $ 7,699 [1] $ (2,104) $ (1,757) $ 3,550 $ (767) $ 18,963 [1] $ (1,078) $ (26,777)
Basic earnings (loss) per share (in dollars per share) $ 0.37 $ 0.20 $ 0.42 $ 0.68 $ (0.19) $ (0.16) $ 0.32 $ (0.07) $ 1.67 $ (0.10) $ (2.39)
Diluted earnings (loss) per share (in dollars per share) $ 0.37 $ 0.20 $ 0.42 $ 0.68 $ (0.19) $ (0.16) $ 0.32 $ (0.07) $ 1.67 $ (0.10) $ (2.39)
Anti-dilutive securities outstanding (in shares)                 65 167 125
[1] Includes a $6.2 million tax benefit related to the U.S. Tax Cuts and Jobs Act.