Note 4 - Select Balance Sheet Details (Details Textual)	1 Months Ended	3 Months Ended	12 Months Ended
	May 31, 2021 USD ($) shares	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Inventory, Gross, Total		$ 24,000	$ 25,000
Inventory, Work in Process, Gross		7,000	7,000
Inventory, Finished Goods, Gross		17,000	18,000
Inventory, LIFO Reserve		$ 3,000	3,000
Number of Reporting Units		1
Goodwill, Ending Balance		$ 3,416,000	3,416,000
Goodwill, Impairment Loss		0	$ 0
Other Assets [Member]
Deferred Offering Costs		70,000
Lincoln Park [Member]
Sale of Stock, Number of Shares Issued in Transaction (in shares) | shares	1,000,000
Deferred Offering Costs	$ 70,000
Identity Management [Member]
Goodwill, Ending Balance		$ (18,961,000)