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Note 9 - Stock-based Compensation (Details Textual) - USD ($) |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jul. 01, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares) | 1,900,000 |  |  |  |  |
Fungible Share Reserve Feature, Shares Subject for Each Share Granted (in shares) | 1 |  |  |  |  |
Fungible Share Reserve Feature, Shares Subject to All Other Awards (in shares) | 1.80 |  |  |  |  |
Maximum Number of Shares of Class A Common Stock Awarded to any Participant in the Incentive Plan in any Calendar Year (in shares) | 500,000 | 500,000 |  | 500,000 |  | 200,000
Maximum Cash Awarded to any Participant in the Incentive Plan in any Calendar Year | $ 4,000,000 | $ 4,000,000 |  | $ 4,000,000 |  | $ 2,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) |  | 2,515,193 |  | 2,515,193 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |  | 4,200,000 |  | 4,200,000 |  |
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares) |  |  |  | 5,119 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Per Share Weighted Average Price of Shares Purchased (in dollars per share) |  | $ 14.15 |  | $ 14.15 |  |
Payment, Tax Withholding, Share-based Payment Arrangement |  |  |  | $ 68,000 | $ 762,000 |
Maximum [Member] |  |  |  |  |  |
Payment, Tax Withholding, Share-based Payment Arrangement |  |  |  | 100,000 |  |
Salaries Wages And Related Expenses [Member] |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  | $ 200,000 | $ 600,000 | 700,000 | 1,100,000 |
General Supplies and Expenses [Member] |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  | $ 400,000 | $ 400,000 | $ 400,000 | $ 400,000 |

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- Definition The fungible share feature under which shares subject to stock options and stock appreciation rights will be counted for granted awards. + References No definition available. + Details
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- Definition The fungible share feature under which shares subject to stock options and stock appreciation rights will be counted for all other awards. + References No definition available. + Details
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- Definition Maximum amount of cash that can be awarded to any participant in a calendar year under the incentive plan. + References No definition available. + Details
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- Definition The maximum number of shares of the Class A common stock that can be awarded to a participant in the incentive plan in any calendar-year. + References No definition available. + Details
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- Definition Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + 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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