Note 1 - Background and Basis of Presentation - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Revenues, Type	$ 1,215	$ 2,738	$ 2,890	$ 4,936
Amazon [Member]
Revenues, Type	680	999	880	1,984
Costco [Member]
Revenues, Type	137	0	246	0
Walmart [Member]
Revenues, Type	115	1,190	168	2,038
Variety Wholesalers [Member]
Revenues, Type	0	0	459	0
Fred Meyer [Member]
Revenues, Type	0	379	439	544
Three Largest Customers [Member]
Revenues, Type	932	2,568	2,192	4,566
Product [Member]
Revenues, Type	1,127	2,670	2,716	4,799
License [Member]
Revenues, Type	$ 88	$ 68	$ 174	$ 137