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Note 14 - Related Party Transactions (Details Textual) - USD ($)
1 Months Ended
Mar. 13, 2019
Dec. 01, 2018
Nov. 30, 2018
Mar. 31, 2024
Dec. 31, 2021
May 31, 2021
May 14, 2021
Feb. 04, 2021
Oct. 31, 2013
Warrants and Rights Outstanding, Term (Year)       5 years          
Placement Agent Warrants [Member]                  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)       179,536     179,536    
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)         $ 4   $ 2.85    
Warrants and Rights Outstanding, Term (Year)             5 years    
Series D Preferred Stock Warrants [Member]                  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)             592,106    
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)             $ 2.51    
Warrants and Rights Outstanding, Term (Year)             5 years 6 months    
Taglich Brothers Inc. [Member]                  
Related Party Transaction, Monthly Fees for Services, First Three Months     $ 8,000            
Related Party Transaction, Monthly Fees for Services, After Three Months     5,000            
Related Party Transaction, Success Fee, Revenue Target Under 5 Million   $ 200,000 200,000            
Related Party Transaction, Success Fee, Revenue Target Over 200 Million     $ 1,000,000            
Taglich Brothers Inc. [Member] | Placement Agent Warrants [Member]                  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)       4,246         10,926
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)       $ 321         $ 761.61
Taglich Brothers Inc. [Member] | Investor Shareholder Warrants [Member]                  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)               29,084  
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)               $ 3.875  
Warrants and Rights Outstanding, Term (Year)               5 years  
Taglich Brothers Inc. [Member] | Series D Preferred Stock Warrants [Member]                  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)           53,861      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)           $ 2.85      
Warrants and Rights Outstanding, Term (Year)           5 years      
Michael Taglich [Member]                  
Stock Issued During Period, Units, New Issues (in shares) 350                
Proceeds from Issuance or Sale of Equity, Total $ 350,000                
Michael Taglich [Member] | Placement Agent Warrants [Member]                  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)       1,080          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)       $ 1,000