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Note 11 - Stock-based Compensation (Details Textual) - USD ($)
12 Months Ended
Dec. 22, 2021
Nov. 01, 2021
Apr. 01, 2021
Apr. 26, 2019
Dec. 31, 2018
Dec. 31, 2022
Dec. 31, 2021
May 08, 2019
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross             80,000  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures and Expirations in Period, Total           1,120,000 460,000  
Common Stock Awards, Unvested         7,100,000      
Common Stock Awards, Fair Value Per Share         $ 0.32      
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total     1,500,000          
Shares, Restricted Stock Award, Subject to Annual Forfeiture     750,000          
Series B Preferred Stock [Member]                
Preferred Stock, Convertible, Shares Issuable         6,980,000      
Conversion of Membership Units Into Common Stock [Member]                
Stock Issued During Period, Shares, Conversion of Convertible Securities       71,000        
Conversion of Membership Units Into Series B Convertible Preferred Stock [Member]                
Stock Issued During Period, Shares, Conversion of Convertible Securities         69,815      
Common Stock [Member]                
Share-Based Payment Arrangement, Expense             $ 376,000  
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period         2 years      
Restricted Stock [Member]                
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Granted     1,500,000          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Granted     $ 65,000          
The 2019 Omnibus Incentive Plan [Member]                
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant 26,072,542             11,072,542
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized 15,000,000.0              
Ownership Percentage 50.30%              
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross           0    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures and Expirations in Period, Total           1,120,000 460,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options Grant Date Fair Value             $ 80,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Fair Value             12,000  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total           $ 340,000    
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total           7,142,000    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition           2 years 6 months    
The 2019 Omnibus Incentive Plan [Member] | Director [Member]                
Stock Issued During Period, Shares, Issued for Services   250,000            
The 2019 Omnibus Incentive Plan [Member] | Share-Based Payment Arrangement, Option [Member]                
Share-Based Payment Arrangement, Expense           $ 11,000 151,000  
The 2019 Omnibus Incentive Plan [Member] | Restricted Stock [Member]                
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total           165,000    
Share-Based Payment Arrangement, Expense           150,000 $ 26,000  
Share-based Compensation Arrangement by Share-based Payment Award, Award Other Than Options, Grants in Period, Grant Date Fair Value           $ 290,000    
The 2019 Omnibus Incentive Plan [Member] | Restricted Stock [Member] | Director [Member]                
Stock Issued During Period, Shares, Issued for Services   250,000            
Stock Issued During Period, Shares Subject to Forfeiture, Increments   125,000            
Stock Issued During Period, Value, Issued for Services   $ 12,775