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Note 17 - Stockholders' Equity (Details Textual)
 3 Months Ended 9 Months Ended
Nov. 20, 2020
Jul. 23, 2020
USD ($)
shares
Mar. 30, 2020
USD ($)
$ / shares
shares
Sep. 23, 2015
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
$ / shares
shares
Jun. 30, 2021
USD ($)
shares
Mar. 31, 2021
USD ($)
shares
Sep. 30, 2020
USD ($)
shares
Jun. 30, 2020
USD ($)
shares
Mar. 31, 2020
shares
Sep. 30, 2021
USD ($)
$ / shares
shares
Sep. 30, 2020
USD ($)
shares
Preferred Stock, Shares Authorized (in shares)         5,000,000           5,000,000  
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares         $ 1           $ 1  
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 $ 5,594,795
Share-based Payment Arrangement, Expense | $         $ 58,050     $ 54,230     $ 240,321 $ 709,788
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture, Total | $         $ 6,008 $ 5,505 $ 7,510 $ 7,003 $ 15,007      
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  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)       8,681                
Dividends, Paid-in-kind, Total | $       $ 41,688 $ (0)     $ (0)     $ (0) $ 112,686
Common Stock [Member]                        
Stock Issued During Period, Shares, New Issues (in shares)               4,264,312 31,440 87,500    
Stock Issued During Period, Shares, Conversion of Warrant (in shares)               795,538   121,500    
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total (in shares)         3,750 1,250 1,250 38,250        
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)         1,888 1,748 2,091 1,291 2,143      
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture, Total | $         $ 0 $ 0 $ 0 $ 1 $ 1      
Director [Member] | Common Stock [Member]                        
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture, Total (in shares)         1,888     1,291     5,727 3,434
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture, Total | $         $ 6,008     $ 7,003     $ 19,023 $ 22,010
Restricted Stock [Member]                        
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total (in shares)               38,250     6,250 38,250
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 | $                     $ 18,456  
Share-based Payment Arrangement, Expense | $         $ 18,360           $ 52,081  
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)   283,038                    
Referral Fee Warrants [Member] | Investor [Member]                        
Class of Warrant or Right, Issued During Period (in shares)                       94,655
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)               15,625       15,625
Referral Fee Warrants [Member] | Employee [Member]                        
Class of Warrant or Right, Issued During Period (in shares)                       12,921
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)               3,125       3,125
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 | $   $ 22,700,000                    
Stock Issued During Period, Shares, New Issues (in shares)   4,264,312                    
Stock Issued During Period, Shares, Conversion of Warrant (in shares)   795,538                    
Reverse Stock Split [Member]                        
Stockholders' Equity Note, Stock Split, Conversion Ratio 8