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Note 4 - Investments (Details Textual) - USD ($)	3 Months Ended				9 Months Ended
Note 4 - Investments (Details Textual) - USD ($)	Sep. 30, 2023	Jun. 30, 2023	Sep. 30, 2022	Jun. 30, 2021	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Equity Method Investments	$ 3,479,000				$ 3,479,000
Gain (Loss) on Investments	15,000		$ (38,000)		701,000	$ (195,000)
Gain (Loss) on Investments	(15,000)		$ 38,000		(701,000)	$ 195,000
Payments to Acquire Investments, Total					155,000
Long-Term Investments	$ 3,634,000				$ 3,634,000		$ 5,180,000
Privately-Held Identity and Professional Services Company With Ties to the FinTech Industry [Member]
Equity Method Investment, Ownership Percentage	28.00%				28.00%
Privately Held Company Providing Supply Chain and Receivables Financing [Member]
Payments to Acquire Investments, Total				$ 1,000,000
Asset Impairment Charges		$ 1,000,000
Long-Term Investments	$ 0				$ 0