Note 2 - Significant Accounting Policies (Details Textual) - USD ($) shares in Thousands, $ / shares in Thousands	3 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Mar. 31, 2023
Cash, Uninsured Amount	$ 595,000		$ 638,000
Contract with Customer, Liability, Revenue Recognized	27,000	$ 39,000
Advertising Expense	$ 6,184	$ 8,796
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	0
Earnings Per Share, Basic	$ 0	$ 0
Minimum [Member]
Property, Plant and Equipment, Useful Life	5 years
Maximum [Member]
Property, Plant and Equipment, Useful Life	7 years