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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, 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
Loss from continuing operations                 $ (8,392) $ (6,741) $ (17,812)
Loss on discontinued operations                 (1,771) (2,522) (11,576)
Net loss $ (2,158) $ (2,069) $ (2,068) $ (3,868) $ 5,834 $ 727 $ (6,242) $ (9,583) $ (10,163) $ (9,263) $ (29,388)
Basic weighted-average common shares outstanding (in shares)                 9,613 9,588 9,560
Effect of potentially dilutive common shares(1) (in shares) [1]                
Diluted weighted-average common shares outstanding (in shares)                 9,613 9,588 9,560
Continuing operations, basic and diluted (in dollars per share) $ (0.20) $ (0.16) $ (0.15) $ (0.37)         $ (0.88) $ (0.71) $ (1.86)
Discontinued operations, basic and diluted (in dollars per share) (0.03) (0.05) (0.07) (0.03)         (0.18) (0.26) (1.21)
Net loss per share, basic and diluted (in dollars per share) $ (0.23) $ (0.21) $ (0.22) $ (0.40)         $ (1.06) $ (0.97) $ (3.07)
[1] The weighted-average number of antidilutive shares not included in the computation of diluted loss per share was approximately 196,000, 198,000 and 179,000 for the years ended December 31, 2017, 2016 and 2015, respectively.