Note 4 - Property and Equipment - Property and Equipment (Details) - USD ($)	Mar. 31, 2024	Mar. 31, 2023
Property and equipment, gross	$ 298,000	$ 179,000
Less accumulated depreciation and amortization	(203,000)	(178,000)
Total property and equipment	95,000	1,000
Computer Equipment [Member]
Property and equipment, gross	176,000	169,000
Furniture and Fixtures [Member]
Property and equipment, gross	10,000	10,000
Tools, Dies and Molds [Member]
Property and equipment, gross	$ 112,000	$ 0