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Note 7 - Revolving Credit Agreement (Details Narrative) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 28, 2015
May. 24, 2017
Dec. 31, 2014
Jun. 29, 2014
Dec. 31, 2013
Note 7 - Revolving Credit Agreement Details Narrative          
Line of Credit Facility, Maximum Borrowing Capacity $ 20,000,000        
Letter of credit sub-facility $ 1,000,000        
Line of Credit Maximum Borrowing Capacity may be increased in the last six months of the term   $ 35,000,000      
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.375%        
Line of Credit Facility, Amount Outstanding $ 0        
Line of Credit Facility, Remaining Borrowing Capacity 11,409,000        
Unrestricted Cash on hand $ 15,789,000   $ 17,711,000 $ 17,160,000 $ 16,489,000