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Note 14 - Related Party Transactions (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended
Mar. 13, 2019
Nov. 30, 2018
Dec. 31, 2022
Dec. 31, 2021
May 31, 2021
May 14, 2021
Oct. 31, 2013
Warrants and Rights Outstanding, Term (Year)     5 years        
Placement Agent Warrants [Member]              
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)       $ 4.00   $ 2.85  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)     179,536     179,536  
Warrants and Rights Outstanding, Term (Year)           5 years  
Taglich Brothers Inc. [Member]              
Related Party, Ownership Percentage Of Stock     3.60%        
Related Party Transaction, Monthly Fees for Services, First Three Months   $ 8          
Related Party Transaction, Monthly Fees for Services, After Three Months   5          
Related Party Transaction, Success Fee, Revenue Target Under 5 Million   200          
Related Party Transaction, Success Fee, Revenue Target Over 200 Million   $ 1,000          
Taglich Brothers Inc. [Member] | Placement Agent Warrants [Member]              
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)             10,926
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)             $ 761.61
Taglich Brothers Inc. [Member] | Warrants Associated with the February and May 2021 Offerings [Member]              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)         82,945    
Taglich Brothers Inc. [Member] | Warrants Associated with the February and May 2021 Offerings [Member] | Weighted Average [Member]              
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)         $ 3.21    
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            
Michael Taglich [Member] | Placement Agent Warrants [Member]              
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)     $ 1,000        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)     1,080