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Note 10 - Stock Options, Incentive Plans, Stock Awards, and Employee Benefit Plan (Details Textual)
12 Months Ended
Jan. 01, 2019
shares
Jan. 01, 2018
shares
Jan. 01, 2017
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 27, 2016
USD ($)
shares
Jan. 01, 2016
shares
Jul. 23, 2015
Apr. 24, 2015
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
shares
Treasury Stock, Shares, Acquired         246,717       246,717  
Treasury Stock, Value, Acquired, Cost Method | $         $ 431,755       $ 431,705 $ 48,237
Allocated Share-based Compensation Expense | $                 1,314,778 $ 1,275,130
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $       $ 4,082,025         $ 4,082,025  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition                 4 years 62 days  
Share Price | $ / shares       $ 1.85         $ 1.85  
Restricted Stock [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period                 10 years  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period                 266,667  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period                 696,159  
Reverse Stock Split [Member]                    
Stockholders' Equity Note, Stock Split, Conversion Ratio             15      
Equity Incentive Plan 2025 [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized       5,000,000         5,000,000  
Increase in Capital Shares Reserved for Future Issuance Per Year                 5.00%  
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period                   117,666
Equity Incentive Plan 2025 [Member] | Director [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period                 133,334 66,666
Equity Incentive Plan 2025 [Member] | Employees [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period                   51,000
Equity Incentive Plan 2025 [Member] | Director 1 [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period                 66,667  
Equity Incentive Plan 2025 [Member] | Director 1 [Member] | Subsequent Event [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period     22,223              
Equity Incentive Plan 2025 [Member] | Director 1 [Member] | Scenario, Forecast [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 22,222 22,222                
Equity Incentive Plan 2025 [Member] | Director 2 [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period                 66,667  
Equity Incentive Plan 2025 [Member] | Director 2 [Member] | Subsequent Event [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period     22,223              
Equity Incentive Plan 2025 [Member] | Director 2 [Member] | Scenario, Forecast [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period 22,222 22,222                
Employment Agreement [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant                   266,667
Director Plan [Member] | Director 1 [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period           11,112   11,112   33,333
Director Plan [Member] | Director 1 [Member] | Subsequent Event [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period     11,109              
Employee Stock Purchase Plan [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent       85.00%            
Stock Issued During Period, Shares, Employee Stock Purchase Plans                 0 0