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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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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Section 45
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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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