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Note 7 - Indebtedness (Details Textual) $ / shares in Units, $ in Thousands |  |  |  |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 01, 2024 USD ($) | Apr. 05, 2024 USD ($) | Mar. 05, 2021 USD ($) | Aug. 12, 2019 USD ($) $ / shares | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Mar. 31, 2024 USD ($) | Oct. 05, 2023 USD ($)
Long-Term Debt |  |  |  |  | $ 73,125 |  | $ 73,125 |  |  |
Repayments of Debt |  |  |  |  |  |  | 16,875 | $ 13,000 |  |
Gain (Loss) on Extinguishment of Debt |  |  |  |  | (0) | $ (0) | 3,197 | $ (0) |  |
The Credit Facility Term Loan [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Fee Amount |  |  |  |  | 1,987 |  | 1,987 |  |  |
Senior Secured Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term (Year) |  |  | 4 years |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  | 35,500 |  | 35,500 |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  |  | 89,500 |  | 89,500 |  |  |
Senior Secured Credit Agreement [Member] | Prepaid Expenses, Other and Other Assets [Member] |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  | 1,353 |  | 1,353 |  | $ 321 |
Senior Secured Credit Agreement [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Repayments of Lines of Credit | $ 4,500 |  |  |  |  |  |  |  |  |
Senior Secured Credit Agreement [Member] | The Credit Facility Term Loan [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Fee Amount |  |  |  |  | $ 745 |  | 745 |  |  |
Senior Secured Credit Agreement [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 3.50% |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  |  |  |  | 0.35% |  |  |  |  |
Senior Secured Credit Agreement [Member] | Maximum [Member] | The Credit Facility Term Loan [Member] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 75,000 |  |  |  |  |  |  | $ 125,000
Senior Secured Credit Agreement [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 1.50% |  |  |  |  |
Fixed Charge Coverage Ratio |  | 1.25 |  |  |  |  |  |  |  |
Senior Leverage Ratio |  | 3.5 |  |  |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  |  |  |  | 0.20% |  |  |  |  |
Senior Secured Credit Agreement [Member] | Minimum [Member] | The Credit Facility Term Loan [Member] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | 25,000 |  |  |  |  |  |  |
Senior Secured Credit Agreement [Member] | Swingline Loan [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | 5,000 |  |  |  |  |  |  |
Senior Secured Credit Agreement [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | 75,000 |  |  |  |  |  |  |
Debt Instrument, Fee Amount |  |  |  |  | $ 1,242 |  | $ 1,242 |  |  |
Senior Secured Credit Agreement [Member] | Letter of Credit [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 2,500 |  |  |  |  |  |  |
The Credit Facility Term Loan [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  | 8.40% |  | 8.40% |  |  |
Debt Instrument, Covenant, Maximum Total Leverage Ratio for the First Five Testing Dates |  | 4.5 |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Maximum Total Leverage Ratio for the Sixth, Seventh, and Eighth Testing Dates |  | 4 |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Maximum Total Leverage Ratio Following the Ninth Testing date |  | 3.5 |  |  |  |  |  |  |  |
Term Loan [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  | 8.13% |  | 8.13% |  |  |
Long-Term Debt, Gross |  | $ 75,000 |  |  | $ 73,125 |  | $ 73,125 |  | 0 |
Debt Instrument, Periodic Payment, Principal |  |  |  |  | $ 937 |  | $ 1,875 |  |  |
The Notes [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  | 1.90% |  | 1.90% |  |  |
Long-Term Debt, Gross |  |  |  |  | $ 97,500 |  | $ 97,500 |  | 172,500 |
Long-Term Debt |  |  |  |  | 97,029 |  | 97,029 |  | 171,198 |
Debt Issuance Costs, Net |  |  |  |  | 471 |  | 471 |  | $ 1,302 |
Debt Instrument, Face Amount |  |  |  | $ 172,500 |  |  |  |  |  |
Proceeds from Convertible Debt |  |  |  | $ 167,056 |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 1.375% |  | 1.375% |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Ratio Per 1,000 Principal |  |  |  | 3.5273 |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares |  |  |  | $ 283.5 |  |  |  |  |  |
Outstanding 2025 Notes [Member] |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  | $ 97,500 |  | 97,500 |  |  |
Debt Instrument, Repurchased Face Amount |  | $ 75,000 |  |  |  |  |  |  |  |
Repayments of Debt |  | 71,250 |  |  |  |  |  |  |  |
Interest Payable |  | $ 160 |  |  |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  |  |  |  |  |  | $ 3,197 |  |  |

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