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Note 7 - Shareholders' Equity (Tables)
9 Months Ended
Sep. 27, 2015
Note 8 - Shareholders Equity Tables  
Components of Stock Compensation Expense

   Three-month periods ended  Nine-month periods ended
   September 27,  September 28,  September 27,  September 28,
   2015  2014  2015  2014
Stock options  $112   $142   $368   $430 
Restricted stock grants:                    
   Employee   23    4    71    4 
   President and CEO   —      34    —      117 
Board of Directors compensation –                    
   stock grant   —      57    —      170 
     Total  $135   $237   $439   $721 
Schedule of Stock Option Activity

   Number of Shares  Weighted Average Exercise Price  Weighted Average Remaining Contractual Term (years)  Aggregate Intrinsic Value
Outstanding at January 1, 2015   2,056,122   $6.66           
Granted   311,250    3.83           
Exercised   (8,502)   3.37           
Forfeited or expired   (68,166)   12.21           
Outstanding at September 27, 2015   2,290,704    6.12    3.61   $1,985 
Vested and expected to vest at September 27, 2015   2,151,104    6.27    3.47   $1,763 
Exercisable at September 27, 2015   1,387,971   $5.10    2.69   $1,184