Note 1 - Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Revenues, Type	$ 10,785	$ 9,070
Amazon [Member]
Revenues, Type	4,156	1,815
Walmart [Member]
Revenues, Type	3,322	4,769
Two Largest Customers [Member]
Revenues, Type	7,478	6,584
Product [Member]
Revenues, Type	10,449	8,677
License [Member]
Revenues, Type	336	218
Royalty [Member]
Revenues, Type	$ 0	$ 175