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Note 9 - Capital Stock and Stock-based Compensation (Details Textual) $ / shares in Units, $ in Millions |  |  | 9 Months Ended
--- | --- | --- | ---
Jun. 11, 2020 shares | May 16, 2019 | Sep. 30, 2020 USD ($) $ / shares shares | Sep. 30, 2019 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares) | 3,700,000 |  |  |
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) |  |  | 3,288,084 |
Restricted Stock Units Ratio |  |  | 1.49 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ |  |  | $ 5.4 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  | 2 years 4 months 24 days |
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 | $ 1.21
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) |  |  | 5,473,292 | 4,055,076
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 |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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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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