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Note 3 - Investments (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 30, 2016
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Cost-method Investments, Other than Temporary Impairment       $ 363,000
Long-term Investments [Member]          
Loan Agreements, Notes Receivable       2,321,000  
Other Nonoperating Income (Expense) [Member] | Equity Method Investments [Member]          
Gain (Loss) on Investments, Total       $ (332,000)  
Privately-Held Identity and Professional Services Company With Ties to the FinTech Industry [Member]          
Equity Method Investment, Ownership Percentage   40.00%      
Investments, Unfunded Commitments $ 1,000,000        
Investment, Unfunded Commitments, to Be Held in Escrow $ 500,000        
Privately-Held Identity and Professional Services Company With Ties to the FinTech Industry [Member] | Loan Agreement, Six Percent, Maturing June 2021 [Member]          
Payments to Acquire Notes Receivable   $ 1,000,000      
Notes Receivable, Stated Interest Rate   6.00%      
Privately-Held Identity and Professional Services Company With Ties to the FinTech Industry [Member] | Loan Agreement, Six Percent, Maturing November 2021 [Member]          
Payments to Acquire Notes Receivable   $ 500,000      
Notes Receivable, Stated Interest Rate   6.00%      
NKD Enterprises LLC [Member]          
Equity Method Investment, Ownership Percentage       25.50%  
Equity Method Investments       $ 0  
Lumense Inc. [Member]          
Cost-method Investments, Other than Temporary Impairment     $ 250,000 $ 0 $ 250,000