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Note 15 - Stockholders' Equity (Details Textual) - USD ($)
 3 Months Ended 6 Months Ended
Mar. 08, 2022
Jun. 18, 2021
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2022
Dec. 31, 2021
Jun. 30, 2021
Preferred Stock, Shares Authorized (in shares)     5,000,000       5,000,000    
Preferred Stock, Par or Stated Value Per Share (in dollars per share)     $ 1       $ 1    
Stock Issued During Period, Value, Acquisitions       $ 600,004          
Share-based Payment Arrangement, Expense     $ 83,699   $ 41,123   $ 193,396   $ 182,271
Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture, Total     $ 18,006 22,020 $ 5,505 $ 7,510      
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)     0   0   0   0
Class of Warrant or Right, Issued During Period (in shares)     0   0   0   0
Common Stock [Member]                  
Stock Issued During Period, Value, Acquisitions       $ 27          
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares)     26,006            
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total (in shares)     1,250 274,250 1,250 1,250      
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited (in shares)     1,250   1,250        
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture, Total (in shares)     9,117 9,382 1,748 2,091      
Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture, Total     $ 1 $ 1 $ 0 $ 0      
Common Stock [Member] | Director [Member]                  
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture, Total (in shares)     9,117   1,748   18,499   3,839
Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture, Total     $ 18,006   $ 5,505   $ 40,026   $ 13,015
Restricted Stock [Member]                  
Share-based Payment Arrangement, Expense     $ 51,204   $ 16,346   $ 91,044   $ 33,721
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total (in shares)             275,500   2,500
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)             3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value             $ 592,075   $ 8,425
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited (in shares)             1,250   1,250
Employee Stock Purchase Plan [Member]                  
Common Stock, Capital Shares Reserved for Future Issuance (in shares)   789,000              
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent   85.00%              
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares)             26,006 19,484  
Share-based Payment Arrangement, Expense             $ 8,314 $ 10,680  
Swivel Secure Europe [Member]                  
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) 269,060                
Business Combination, Indemnification Assets, Amount as of Acquisition Date $ 89,687                
Stock Issued During Period, Value, Acquisitions $ 600,004                
Business Acquisition, Share Price (in dollars per share) $ 2.23