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Note 2 - Summary of Significant Accounting Policies - Loss per Basic and Diluted Weighted Average Common Share Outstanding for Continuing and Discontinued Operations (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
Loss from continuing operations                 $ (9,263) $ (29,388) $ (6,173)
Loss from discontinued operations                 (11,714)
Net loss $ 5,834 $ 727 $ (6,242) $ (9,583) $ (13,693) $ (1,515) $ (12,079) $ (2,101) $ (9,263) $ (29,388) $ (17,887)
Basic weighted-average common shares outstanding (in shares)                 9,588 9,560 9,515
Effect of potentially dilutive common shares(1) (in shares) [1]                
Diluted weighted-average common shares outstanding (in shares)                 9,588 9,560 9,515
Continuing operations (in dollars per share)                 $ (0.97) $ (3.07) $ (0.65)
Discontinued operations (in dollars per share)                 (1.23)
Total (in dollars per share)         $ (1.43) $ (0.16) $ (1.26) $ (0.22) $ (0.97) $ (3.07) $ (1.88)
Antidilutive shares excluded from net loss per diluted common share calculation (in shares)                 27 52 65
[1] Represents the effect of the assumed exercise of stock options and the vesting of restricted stock units and performance stock awards, based on the treasury stock method.