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Note 15 - Stockholders' Equity (Details Textual) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 08, 2022
Jun. 18, 2021
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2020
Preferred Stock, Shares Authorized (in shares)     5,000,000    
Preferred Stock, Par or Stated Value Per Share (in dollars per share)     $ 1    
Stock Issued During Period, Value, Acquisitions     $ 600,004    
Share-based Payment Arrangement, Expense     109,697 $ 141,148  
Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture, Total     $ 22,020 $ 7,510  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)     0 0 0
Common Stock [Member]          
Stock Issued During Period, Value, Acquisitions     $ 27    
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture, Total (in shares)     9,382 2,091  
Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture, Total     $ 1 $ 0  
Common Stock [Member] | Director [Member]          
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture, Total (in shares)     9,382 2,091  
Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture, Total     $ 20,020 $ 7,510  
Restricted Stock [Member]          
Share-based Payment Arrangement, Expense     $ 39,840 $ 17,375  
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited (in shares)     274,250 1,250  
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     $ 589,638 $ 4,550  
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)   19,484      
Share-based Payment Arrangement, Expense   $ 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