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Note 5 - Notes Receivable (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 30, 2016
Feb. 28, 2021
Jan. 31, 2020
Oct. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2021
Mar. 31, 2020
Jun. 30, 2019
Sep. 30, 2017
Ownership Percentage             28.00%      
Transfer Advisory Business to New Entity [Member]                    
Financing Receivable, after Allowance for Credit Loss, Total             $ 2,806,000      
Cash, Ending Balance             $ 800,000      
Ownership Percentage             28.00%      
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       $ 550,000        
Equity Method Investment, Ownership Percentage                 40.00%  
Notes Receivable, Stated Interest Rate   4.60%                
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       $ 500,000            
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 January 2022 [Member]                    
Payments to Acquire Notes Receivable     $ 1,000,000              
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