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Note 1 - Description of Business and Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023	Aug. 12, 2019
Accounts Receivable, Credit Loss Expense (Reversal)	$ 218	$ 790	$ 736
Goodwill, Impairment Loss	0	156,892	0
Impairment of Intangible Assets, Finite-Lived	$ 0	117,641	0
Expected Payments to Acquire Businesses, Net of Cash Acquired		$ 87,187	$ 6,140
Equity Plan 2014 [Member] | Director [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)	1 year
Equity Plan 2014 [Member] | Share-Based Payment Arrangement, Option [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)	3 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)	6 years
The Notes [Member] | Senior Notes [Member]
Debt Instrument, Interest Rate, Stated Percentage	1.375%	1.375%		1.375%
Minimum [Member]
Lessee, Operating Lease, Remaining Lease Term (Month)	3 months
Finite-Lived Intangible Asset, Useful Life (Year)	3 years
Maximum [Member]
Lessee, Operating Lease, Remaining Lease Term (Month)	11 years
Finite-Lived Intangible Asset, Useful Life (Year)	15 years

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