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Note 6 - Notes Receivable (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Sep. 18, 2017
Privately-Held Identity and Professional Services Company With Ties to the FinTech Industry [Member]          
Receivable Commitment to Lend         $ 1,500,000
Financing Receivable, Gross   $ 1,500,000   $ 1,250,000  
Notes Receivable, Stated Interest Rate   6.00%      
Notes Receivable, Renewal Term   1 year      
Payments to Acquire Notes Receivable   $ 550,000      
Notes Receiavble Term   180 days      
Privately-Held Identity and Professional Services Company With Ties to the FinTech Industry [Member] | Notes Receivable One, Maturity Date Extended [Member]          
Financing Receivable, Gross     $ 250,000    
Privately-Held Identity and Professional Services Company With Ties to the FinTech Industry [Member] | Notes Receivable Two, Maturity Date Extended [Member]          
Financing Receivable, Gross   $ 225,000      
Private Limited India Based Company in the FinTech Industry [Member]          
Receivable Commitment to Lend $ 435,000        
Notes Receivable, Stated Interest Rate 5.00%        
Payments to Acquire Notes Receivable $ 235,000        
Private Limited India Based Company in the FinTech Industry [Member] | Maximum [Member]          
Notes Receivable, Conversion, Percentage 10.00%