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Note 9 - Capital Stock and Stock-based Compensation (Details Textual) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Jun. 11, 2020 shares | May 16, 2019 | Jun. 30, 2020 USD ($) $ / shares shares | Jun. 30, 2019 $ / shares | Jun. 30, 2020 USD ($) $ / shares shares | Jun. 30, 2019 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares) | 3,700,000 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) | 24,608,929 |  |  |  |  |
Fungible Share Ratio for Deferred Stock Awards | 1.49 | 1.79 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) |  |  | 3,264,267 |  | 3,264,267 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ |  |  | $ 6.5 |  | $ 6.5 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  |  | 2 years 6 months |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares |  |  | $ 1.21 | $ 0.97 | $ 1.21 | $ 1.56
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) |  |  |  |  | 5,727,716 | 3,300,586
Market Condition Restricted Stock Units [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares |  |  |  |  | $ 2.98 | $ 4.16

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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