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Note 11 - Related Party Transactions (Details Textual) - USD ($) |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Aug. 26, 2016 | Sep. 30, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Operating Lease, Right-of-Use Asset |  |  | $ 26,356,000 |  | $ 26,356,000 |  | $ 28,116,000
Affiliated Entity [Member] |  |  |  |  |  |  |
Operating Lease, Expense |  |  | 700,000 | $ 700,000 | 1,400,000 | $ 1,400,000 |
Operating Lease, Right-of-Use Asset |  |  | 2,700,000 |  | 2,700,000 |  |
Operating Lease, Liability, Total |  |  | 3,900,000 |  | $ 3,900,000 |  |
Affiliated Entity [Member] | Mosing Holdings [Member] |  |  |  |  |  |  |
Percentage of Tax Benefits Realized Payable Under Tax Receivable Agreement | 85.00% |  |  |  |  |  |
Percentage of Tax Benefits Retained Under Tax Receivable Agreement | 15.00% |  |  |  |  |  |
Cumulative Earnings (Deficit), Period (Month) |  |  |  |  | 36 months |  |
Tax Receivable Agreement, Liability, Estimated Termination Payment |  |  | $ 66,500,000 |  | $ 66,500,000 |  |
Tax Receivable Agreement, Liability, Discount Rate |  |  | 5.00% |  | 5.00% |  |
Affiliated Entity [Member] | Mosing Holdings [Member] | Forecast [Member] |  |  |  |  |  |  |
Tax Receivable Agreement, Cash Payment for Settlement of Early Termination Payment Obligation |  | $ 15,000,000 |  |  |  |  |
Tax Receivable Agreement, Condition of Early Termination Payment Obligation Settlement, Period Over Which Future Contingent Payments May Be Made (Year) |  | 10 years |  |  |  |  |
Tax Receivable Agreement, Condition of Early Termination Payment Obligation Settlement, Future Contingent Payments, Cash Tax Savings Threshold |  | $ 18,057,000 |  |  |  |  |
Affiliated Entity [Member] | Mosing Holdings [Member] | Long-term Treasury Rate [Member] |  |  |  |  |  |  |
Tax Receivable Agreement, Basis Spread on Variable Rate | 3.00% |  |  |  |  |  |

X
- Definition Represents the period of cumulative earnings (deficit). + References No definition available. + Details
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Data Type: | xbrli:durationItemType
Balance Type: | na
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X
- Definition Represents the percentage of realized tax benefits payable under tax receivable agreement. + References No definition available. + Details
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- Definition Represents the percentage of tax benefits retained under tax receivable agreement. + References No definition available. + Details
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- Definition Represents the basis spread on variable rate under a tax receivable agreement. + References No definition available. + Details
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Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the amount of cash payment for settlement of early termination payment obligation in connection with a tax receivable agreement. + References No definition available. + Details
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- Definition Represents the cash savings threshold which, if reached, will trigger future contingent payments to be made as a condition of the settlement of the early termination payment obligation in connection with a tax receivable agreement. + References No definition available. + Details
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- Definition Represents the period of time over which future contingent payments might be made as a condition of the settlement of the early termination payment obligation in connection with a tax receivable agreement. + References No definition available. + Details
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- Definition Represents the discount rate used to estimate the amount that would be payable if the tax receivable agreement were terminated. + References No definition available. + Details
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- Definition Represents the estimated termination payment under a tax receivable agreement, if the agreement were terminated as of the specified date. + References No definition available. + Details
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- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918638-209977 + Details
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Balance Type: | debit
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X
- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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