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Note 8 - Stock-based Compensation (Details Textual) - USD ($)		3 Months Ended		9 Months Ended
	Jul. 01, 2020	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
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)	1,000,000
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)		1,814,712		1,814,712
Payment, Tax Withholding, Share-Based Payment Arrangement				$ 1,099,000	$ 339,000
Common Class A [Member]
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)				42,593
Share-Based Compensation Arrangement by Share-Based Payment Award, Per Share Weighted Average Price of Shares Purchased (in dollars per share)		$ 25.81		$ 25.81
Payment, Tax Withholding, Share-Based Payment Arrangement				$ 1,100,000
Share-Based Payment Arrangement, Option [Member]
Share-Based Payment Arrangement, Expense		$ 900,000	$ 800,000	2,400,000	1,500,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount		0	600,000	0	600,000
General Supplies and Expenses [Member]
Share-Based Payment Arrangement, Expense		900,000	800,000	2,400,000	2,100,000
General and Administrative Expense [Member] | Director [Member]
Share-Based Payment Arrangement, Expense		$ 200,000	$ 200,000	$ 600,000	$ 600,000

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

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.

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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.

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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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- 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 S45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479983/718-10-S45-1

Reference 2: 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 3: 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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- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

+ References

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

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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
-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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- 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
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-Section 50
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
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