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Note 4 - Investments (Details Textual) - USD ($)
1 Months Ended 3 Months Ended
Jun. 30, 2019
Mar. 31, 2020
Mar. 31, 2019
Jun. 30, 2018
Cost-method Investments, Other than Temporary Impairment   $ 1,009,000  
Equity Method Investments   0    
Long-term Investments [Member]        
Loan Agreements, Notes Receivable   2,280,000    
Investment Income (Expense) [Member] | Equity Method Investments [Member]        
Gain (Loss) on Investments, Total   (41,000)    
Privately-Held Identity and Professional Services Company With Ties to the FinTech Industry [Member]        
Equity Method Investment, Ownership Percentage 40.00%      
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      
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      
Lumense Inc. [Member]        
Cost-method Investments, Other than Temporary Impairment   $ 750,000   $ 250,000