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Note 9 - Stock-based Compensation (Details Textual) - USD ($)			3 Months Ended		9 Months Ended
	May 17, 2023	Jul. 01, 2020	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares)	575,000
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)		1.8
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
Maximum Cash Awarded to any Participant in the Incentive Plan in any Calendar Year		$ 4,000,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)			1,063,228		1,063,228
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)			4,775,000		4,775,000
Payment, Tax Withholding, Share-Based Payment Arrangement					$ 339,000	$ 1,520,000
Common Class A [Member]
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)					6,879
Share-Based Compensation Arrangement by Share-Based Payment Award, Per Share Weighted Average Price of Shares Purchased (in dollars per share)			$ 49.27		$ 49.27
Payment, Tax Withholding, Share-Based Payment Arrangement					$ 300,000
Restricted Stock [Member]
Share-Based Payment Arrangement, Expense			$ 800,000	$ 700,000	1,500,000	1,800,000
Share-Based Payment Arrangement, Option [Member]
Share-Based Payment Arrangement, Expense			0	1,000,000	600,000	2,900,000
Salaries Wages And Related Expenses [Member]
Share-Based Payment Arrangement, Expense			800,000	1,700,000	2,100,000	4,700,000
General and Administrative Expense [Member] | Director [Member]
Share-Based Payment Arrangement, Expense			$ 200,000	$ 200,000	$ 600,000	$ 500,000

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.

+ 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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X

- Definition

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

+ References

No definition available.

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X

- 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.

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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479830/718-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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X

- 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
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 15
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-15

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X

- Definition

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

+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 718
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-Section 50
-Paragraph 2
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X

- 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

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-Section 50
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-Publisher FASB
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- Definition

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

+ References

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X

- Definition

Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement.

+ References

No definition available.

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