Note 2 - Significant Accounting Policies (Details Textual)	3 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Mar. 31, 2024
Contract with Customer, Liability, Revenue Recognized	$ 0	$ 6,000	$ 45,000	$ 24,000
Customer Concentration Risk [Member] | Revenue Benchmark [Member]
Number of Major Customers	2	2	2	2
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customer Number 1 [Member]
Concentration Risk, Percentage	31.00%	34.00%	32.00%	36.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customer Number 2 [Member]
Concentration Risk, Percentage	10.00%	22.00%	11.00%	18.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Two Customers [Member]
Concentration Risk, Percentage			88.00%		72.00%