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Note 3 - Investments (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Dec. 30, 2016
Dec. 31, 2022
Jun. 30, 2021
Mar. 31, 2020
Jun. 30, 2018
Dec. 31, 2022
Dec. 31, 2021
Equity Method Investment, Other than Temporary Impairment           $ 1,450,000 $ 0
Equity Method Investments   $ 4,180,000   $ 0   $ 4,180,000 3,615,000
Ownership Percentage   28.00%       28.00%  
Gain (Loss) on Investments, Total           $ 275,000 (172,000)
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount       $ 750,000 $ 250,000    
Long-Term Investments, Total   $ 5,180,000       5,180,000 6,355,000
Long-term Investments [Member]              
Equity Method Investments   1,822,000       1,822,000  
Other Current Liabilities [Member]              
Deposit Liability, Current   651,000       651,000 $ 706,000
Investee [Member]              
Equity Method Investments   0       $ 0  
Investment Income [Member]              
Equity Method Investment, Other than Temporary Impairment   $ 1,450,000          
Privately-Held Identity and Professional Services Company With Ties to the FinTech Industry [Member]              
Equity Method Investment, Ownership Percentage   40.00%       40.00%  
Investments, Unfunded Commitments $ 1,000,000            
Transfer Advisory Business to New Entity [Member]              
Financing Receivable, after Allowance for Credit Loss, Total   $ 2,806,000       $ 2,806,000  
Cash   800,000       800,000  
Privately Held Company Providing Supply Chain and Receivables Financing [Member]              
Payments to Acquire Investments, Total     $ 1,000,000        
Long-Term Investments, Total   $ 1,000,000       $ 1,000,000