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Note 9 - Stock-based Compensation (Details Textual) - USD ($)		3 Months Ended		9 Months Ended
	Jul. 01, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	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					200,000
Maximum Cash Awarded to any Participant in the Incentive Plan in any Calendar Year	$ 4,000,000					$ 2,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)		1,049,793		1,049,793
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)		4,200,000		4,200,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number (in shares)			0		0
Payment, Tax Withholding, Share-based Payment Arrangement				$ 969,000	$ 68,000
Common Class A [Member]
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)				47,128
Share-based Compensation Arrangement by Share-based Payment Award, Per Share Weighted Average Price of Shares Purchased (in dollars per share)		$ 20.55		$ 20.55
Payment, Tax Withholding, Share-based Payment Arrangement				$ 1,000,000.0
Restricted Stock [Member]
Share-based Payment Arrangement, Expense		$ 1,000,000.0		3,600,000
Share-based Payment Arrangement, Option [Member]
Share-based Payment Arrangement, Expense		700,000		1,800,000
Salaries Wages And Related Expenses [Member]
Share-based Payment Arrangement, Expense		1,700,000	$ (200,000)	5,400,000	700,000
General Supplies and Expenses [Member]
Share-based Payment Arrangement, Expense		$ 100,000	$ 400,000	$ 200,000	$ 400,000

X

- 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.

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- Definition

Maximum amount of cash that can be awarded to any participant in a calendar year under the incentive plan.

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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.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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- Definition

Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement.

+ References

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Number of additional shares authorized for issuance under share-based payment arrangement.

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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.

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Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Per share weighted-average price paid for shares purchased on open market for issuance under share-based payment arrangement.

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