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Note 3 - Notes Receivable (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2020
Oct. 31, 2019
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Mar. 31, 2020
Sep. 30, 2017
Privately-Held Identity and Professional Services Company With Ties to the FinTech Industry [Member]              
Receivable Commitment to Lend             $ 1,500,000
Payments to Acquire Notes Receivable         $ 550,000    
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      
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 October 2021 [Member]              
Payments to Acquire Notes Receivable $ 1,000,000 $ 500,000          
Notes Receivable, Stated Interest Rate   6.00%          
Private Limited India Based Company in the FinTech Industry [Member]              
Receivable Commitment to Lend     $ 435,000        
Payments to Acquire Notes Receivable     $ 235,000        
Notes Receivable, Stated Interest Rate     5.00%        
Private Limited India Based Company in the FinTech Industry [Member] | Maximum [Member]              
Notes Receivable, Conversion, Percentage     10.00%        
Private Limited India Based Company in the FinTech Industry [Member] | Notes Receivable [Member]              
Financing Receivable, Allowance for Credit Loss, Ending Balance           $ 259,000