Note 4 - Investments (Details Textual) - USD ($)		3 Months Ended						12 Months Ended
	Dec. 30, 2016	Dec. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2021	Mar. 31, 2020	Jun. 30, 2018	Dec. 31, 2024	Dec. 31, 2023	Aug. 31, 2023
Payments to Acquire Equity Method Investments								$ 398,000	$ 655,000
Equity Method Investments		$ 3,523,000	$ 3,907,000			$ 0		3,523,000	3,907,000
Gain (Loss) on Investments, Total								684,000	773,000
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount						$ 750,000	$ 250,000
Payments to Acquire Investments, Total		98,000
Other Current Liabilities [Member]
Deposit Liability, Current		$ 582,000	1,005,000					$ 582,000	1,005,000
Privately-Held Identity and Professional Services Company With Ties to the FinTech Industry [Member]
Equity Method Investment, Ownership Percentage		26.50%						26.50%
Investments, Unfunded Commitments	$ 1,000,000
Transfer Advisory Business to New Entity [Member]
Equity Method Investment, Ownership Percentage										3.40%
Sale of Stock, Consideration Received on Transaction			2,700,000
Payments to Acquire Equity Method Investments		$ 300,000	500,000
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity		$ 2,800,000						$ 2,800,000
Financing Receivable, after Allowance for Credit Loss										$ 155,000
Privately Held Company Providing Supply Chain and Receivables Financing [Member]
Equity Method Investments			$ 0						$ 0
Payments to Acquire Investments, Total					$ 1,000,000
Asset Impairment Charges				$ 1,000,000