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Note R - Equity (Details Textual)
 6 Months Ended 9 Months Ended 12 Months Ended
Jun. 18, 2021
USD ($)
shares
Nov. 30, 2020
USD ($)
shares
Nov. 20, 2020
Aug. 31, 2020
USD ($)
shares
Jul. 23, 2020
USD ($)
shares
Mar. 30, 2020
USD ($)
$ / shares
shares
Sep. 23, 2015
USD ($)
$ / shares
shares
Jun. 30, 2020
shares
Sep. 30, 2020
shares
Dec. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Jun. 12, 2020
$ / shares
Mar. 12, 2020
$ / shares
Dec. 31, 2019
$ / shares
Preferred Stock, Shares Authorized (in shares)                   5,000,000        
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares                   $ 1        
Share-based Payment Arrangement, Expense | $                   $ 314,715 $ 792,095      
Stock Issued During Period, Shares, Warrants Exercises (in shares)           121,500                
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares           $ 12.00 $ 28.80              
Proceeds from Warrant Exercises | $           $ 1,458,000       0 5,602,595      
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture, Total | $                   $ 25,536 $ 28,511      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)                   (0) (0)      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)             8,681              
Share Price (in dollars per share) | $ / shares                   $ 2.21 $ 3.52 $ 5.20 $ 6.08 $ 4.00
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares)                   186,538        
Dividends, Paid-in-kind, Total | $             $ 41,688     $ (0) $ 112,686      
Common Stock [Member]                            
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares)                   19,484        
Stock Issued During Period, Shares, New Issues (in shares)                     43,939      
Stock Issued During Period, Shares, Conversion of Warrant (in shares)                     918,538      
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total (in shares)                   13,125 41,375      
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited (in shares)                   1,250        
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture, Total (in shares)                   7,828 5,270      
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture, Total | $                   $ 1 $ 0      
Director [Member] | Common Stock [Member]                            
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture, Total (in shares)                   7,828 5,270      
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture, Total | $                   $ 25,536 $ 28,511      
Restricted Stock [Member]                            
Share-based Payment Arrangement, Expense | $                   $ 71,819 $ 23,764      
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total (in shares)   3,125   38,250           13,125        
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited (in shares)                   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 | $   $ 11,250   $ 198,900           $ 44,025        
In The Money Options [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares)                   0 0      
Pre-Funded Warrants [Member]                            
Class of Warrant or Right, Exercised During Period (in shares)         512,500                  
Equity Warrants [Member]                            
Class of Warrant or Right, Exercised During Period (in shares)         284,538                  
Referral Fee Warrants [Member] | Investor [Member]                            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)               15,625            
Class of Warrant or Right, Issued During Period (in shares)               94,655            
Referral Fee Warrants [Member] | Employee [Member]                            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)                 3,125          
Class of Warrant or Right, Issued During Period (in shares)                 12,921          
September 2015 Warrants [Member]                            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares             $ 5.20              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)             48,078              
Warrants and Rights Outstanding, Term (Year)             5 years              
Public Offering [Member]                            
Proceeds from Issuance or Sale of Equity, Total | $         $ 22.7                  
Stock Issued During Period, Shares, New Issues (in shares)         4,264,313                  
Stock Issued During Period, Shares, Conversion of Warrant (in shares)         797,038                  
Public Offering [Member] | Common Stock [Member]                            
Stock Issued During Period, Shares, New Issues (in shares)                     4,264,313      
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                          
Reverse Stock Split [Member]                            
Stockholders' Equity Note, Stock Split, Conversion Ratio     8