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Note 11 - Share-based Compensation - Restricted Stock Units Activity (Details) - $ / shares
12 Months Ended
Jan. 01, 2022
Jan. 02, 2021
Time-based Restricted Stock Units [Member]    
Granted (in shares) 163,005 719,805
Granted, weighted average grant date fair value (in dollars per share) $ 3.81 $ 1.88
Time-based Restricted Stock Units [Member] | The 2014 Plan [Member]    
Outstanding non-vested (in shares) 709,805  
Outstanding non-vested, weighted average grant date fair value (in dollars per share) $ 1.92  
Granted (in shares) 163,005  
Granted, weighted average grant date fair value (in dollars per share) $ 3.81  
Vested (in shares) (452,182)  
Vested, weighted average grant date fair value (in dollars per share) $ 1.89  
Forfeited or expired (in shares) 0  
Forfeited or expired, weighted average grant date fair value (in dollars per share) $ 0  
Outstanding non-vested (in shares) 420,628 709,805
Outstanding non-vested, weighted average grant date fair value (in dollars per share) $ 2.69 $ 1.92
Performance-based Restricted Stock Units [Member]    
Granted (in shares) 125,000 0
Granted, weighted average grant date fair value (in dollars per share) $ 3.26 $ 0
Outstanding non-vested (in shares) 125,000  
Performance-based Restricted Stock Units [Member] | The 2014 Plan [Member]    
Outstanding non-vested (in shares) 0  
Outstanding non-vested, weighted average grant date fair value (in dollars per share) $ 0  
Granted (in shares) 125,000  
Granted, weighted average grant date fair value (in dollars per share) $ 3.26  
Vested (in shares) 0  
Vested, weighted average grant date fair value (in dollars per share) $ 0  
Forfeited or expired (in shares) 0  
Forfeited or expired, weighted average grant date fair value (in dollars per share) $ 0  
Outstanding non-vested (in shares) 125,000 0
Outstanding non-vested, weighted average grant date fair value (in dollars per share) $ 3.26 $ 0
Restricted Stock Units (RSUs) [Member]    
Outstanding non-vested (in shares) 709,805 391,725
Outstanding non-vested, weighted average grant date fair value (in dollars per share) $ 1.92 $ 4.36
Vested (in shares) (452,182) (179,225)
Vested, weighted average grant date fair value (in dollars per share) $ 1.89 $ 3.78
Forfeited or expired (in shares) 0 (222,500)
Forfeited or expired, weighted average grant date fair value (in dollars per share) $ 0 $ 4.55
Outstanding non-vested (in shares) 545,628 709,805
Outstanding non-vested, weighted average grant date fair value (in dollars per share) $ 2.82 $ 1.92