Note 4 - Property and Equipment - Property and Equipment (Details) - USD ($)	Mar. 31, 2023	Mar. 31, 2022
Statement [Line Items]
Property and equipment, gross	$ 179,000	$ 390,000
Less accumulated depreciation and amortization	(178,000)	(388,000)
Property, Plant and Equipment, Net	1,250	2,000
Computer Equipment [Member]
Statement [Line Items]
Property and equipment, gross	169,000	219,000
Furniture and Fixtures [Member]
Statement [Line Items]
Property and equipment, gross	10,000	163,000
Leasehold Improvements [Member]
Statement [Line Items]
Property and equipment, gross	$ 0	$ 8,000