Note 1 - Background and Basis of Presentation - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenues, Type	$ 2,738	$ 2,438	$ 4,936	$ 4,247
Walmart [Member]
Revenues, Type	1,190	1,525	2,038	2,345
Amazon [Member]
Revenues, Type	999	517	1,984	1,085
Fred Meyer [Member]
Revenues, Type	379	287	544	618
Three Largest Customers [Member]
Revenues, Type	2,568	2,329	4,566	4,048
Product [Member]
Revenues, Type	2,670	2,414	4,799	4,146
License [Member]
Revenues, Type	$ 68	$ 24	$ 137	$ 101

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details