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Note 7 - Shareholders' Equity (Details Textual)
12 Months Ended
Jul. 27, 2020
USD ($)
shares
Jan. 01, 2020
USD ($)
Jul. 11, 2019
USD ($)
shares
Jan. 01, 2018
USD ($)
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
shares
Jan. 01, 2021
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Period Increase (Decrease), Total (in shares) | shares         0    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value         $ 51,000 $ 9,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value         20,000 6,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value         $ 0 $ 21,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares) | shares         0 70,445  
Proceeds from Issuance of Private Placement     $ 9,000,000   $ 8,817,000  
Payments of Stock Issuance Costs     $ 183,000        
Stock Issued During Period, Value, New Issues           $ 8,817,000  
Tony Hawk, Inc. [Member]              
Stock Issued During Period, Value, Issued for Services $ 25,000            
Stock Issued During Period, Shares, Issued for Services (in shares) | shares 138,888            
The Skatepark Project [Member]              
Stock Issued During Period, Value, Issued for Services $ 25,000            
Stock Issued During Period, Shares, Issued for Services (in shares) | shares 138,888            
Tony Hawk, Inc and The Skatepark Project [Member]              
Stock Issued During Period, Shares, Issued for Services (in shares) | shares 277,776            
Warrant Issued in Connection with Private Placement [Member]              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares     15,000,000        
Warrants and Rights Outstanding     $ 2,035,000        
Warrant Issued in Connection with Private Placement [Member] | Measurement Input, Share Price [Member]              
Warrants and Rights Outstanding, Measurement Input     0.517        
Warrant Issued in Connection with Private Placement [Member] | Measurement Input, Price Volatility [Member]              
Warrants and Rights Outstanding, Measurement Input     1.0821        
Warrant Issued in Connection with Private Placement [Member] | Measurement Input, Risk Free Interest Rate [Member]              
Warrants and Rights Outstanding, Measurement Input     0.0197        
Warrant Issued in Connection with Private Placement [Member] | Measurement Input, Expected Dividend Rate [Member]              
Warrants and Rights Outstanding, Measurement Input     0        
Warrant Issued in Connection with Private Placement [Member] | Measurement Input, Expected Term [Member]              
Warrants and Rights Outstanding, Measurement Input     1        
Private Placement [Member]              
Stock Issued During Period, Shares, New Issues (in shares) | shares     15,000,000        
Stock Issued During Period, Value, New Issues     $ 6,782,000        
Restricted Stock Units (RSUs) [Member] | Non-employee Directors [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Month)   1 year   1 year      
Share-based Payment Arrangement, Expensed and Capitalized, Amount, Total   $ 25,000   $ 15,000      
Restricted Stock [Member]              
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares) | shares         17,928    
Average Price Paid Per Share, Shares Withheld For Tax Purposes (in dollars per share) | $ / shares         $ 0.31    
Stock Options and Non-vested Stock [Member]              
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total         $ 76,000    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)         2 years 292 days    
The 2011 Incentive Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares) | shares         1,300,000    
Share-based Compensation Arrangement by Share-based Payment Award, Additional Shares Authorized, Percentage of Outstanding Stock         4.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Maximum         10.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) | shares         6,972,192    
The 2011 Incentive Plan [Member] | Share-based Payment Arrangement, Option [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)         10 years    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Month)         4 years    
The 2011 Incentive Plan [Member] | Share-based Payment Arrangement, Option [Member] | Cliff Vesting [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Month)         1 year    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage         25.00%    
The 2011 Incentive Plan [Member] | Subsequent Event [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) | shares             12,084,032