Note 2 - Significant Accounting Policies (Details Textual) - USD ($) shares in Thousands, $ / shares in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Mar. 31, 2022
Cash, Uninsured Amount	$ 820,000		$ 820,000		$ 887,000
Contract with Customer, Liability, Revenue Recognized	120,000		209,000
Advertising Expense	$ 6,184	$ 7,604	$ 21,216	$ 22,392
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)			0	0
Earnings Per Share, Basic (in dollars per share)	$ 0	$ (0)	$ 0	$ (0)
Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)			5 years
Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)			7 years
Electronic Products [Member]
Warranty Term (Year)			90 years