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Note 13 - Net Income (Loss) per Share of Common Stock | 12 Months Ended
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Dec. 31, 2015
Notes to Financial Statements |
Earnings Per Share [Text Block] | 13. Net I ncome (Loss) per Share of Common Stock For all periods, basic net income (loss) per share is calculated by dividing net income (loss) by the weighted-average common shares outstanding. Diluted net income per share in profitable periods reflects the effect of all potentially dilutive common shares outstanding by dividing net income by the weighted-average of all common and potentially dilutive shares outstanding. Weighted-average shares related to potentially dilutive stock options of 586,589, 755,617 and 20,346 for fiscal years 2015, 2014 and 2013, respectively, were not used to compute diluted net income (loss) per share because the effects would have been anti-dilutive.

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