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Note 3 - Investments (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2019
Sep. 30, 2019
Jun. 30, 2018
Sep. 30, 2019
Dec. 31, 2018
Other Nonoperating Income (Expense) [Member] | Equity Method Investments [Member]          
Gain (Loss) on Investments, Total   $ (104,000)   $ (104,000)  
Privately-Held Identity and Professional Services Company With Ties to the FinTech Industry [Member]          
Payments to Acquire Notes Receivable       $ 500,000 $ 550,000
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]          
Equity Method Investment, Ownership Percentage 40.00%        
Other than Temporary Impairment Losses, Investments, Total     $ 250,000