Annual report pursuant to Section 13 and 15(d)

Note 7 - Stock-based Compensation (Details Textual)

v3.8.0.1
Note 7 - Stock-based Compensation (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended 72 Months Ended
Jul. 31, 2010
Dec. 31, 2017
Jan. 01, 2017
Jan. 03, 2016
Jan. 03, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross   1,468,716 387,255  
Allocated Share-based Compensation Expense   $ 75 $ 78 $ 175  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares   53,622 112,739 257,430  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options   $ 460      
Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross   0 0    
Allocated Share-based Compensation Expense   $ 357 $ 345 $ 335  
Minimum [Member] | Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   1 year      
Maximum [Member] | Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   3 years      
Incentive 2010 Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 350,000        
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Maximum 1.00%        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized     1,500,000   1,944,022
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized, Annual Increase   194,394 182,171    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   1,148,459      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     0 0  
Incentive 2010 Plan [Member] | Performance-based Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period   10 years      
Incentive 2010 Plan [Member] | Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1 year        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 5 years        
Incentive 2010 Plan [Member] | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years