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Note 1 - Description of Business and Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020	Apr. 01, 2021	Aug. 12, 2019
Accounts Receivable, Credit Loss Expense (Reversal)		$ 304	$ 100	$ 1
Payments to Acquire Businesses, Net of Cash Acquired, Total		$ 300,793	0	$ 184,102
Goodwill, Impairment Loss	$ 0
Deferred Tax Liabilities, Deferred Expense, Debt			$ 4,723
Accounting Standards Update 2020-06 [Member]
Debt Instrument, Convertible, Carrying Amount of Equity Component					$ (22,735)
Deferred Tax Liabilities, Deferred Expense, Debt					(5,747)
Convertible Debt, Total					$ 22,799
Equity Plan 2014 [Member] | Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)		1 year
The Notes [Member] | Senior Notes [Member]
Debt Instrument, Interest Rate, Stated Percentage	1.375%	1.375%				1.375%
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)		5 years
Minimum [Member] | Equity Plan 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)		3 years
Minimum [Member] | Equity Plan 2014 [Member] | Share-Based Payment Arrangement, Option [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)		6 years
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)		15 years
Maximum [Member] | Equity Plan 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)		5 years
Maximum [Member] | Equity Plan 2014 [Member] | Share-Based Payment Arrangement, Option [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)		10 years

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