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Note 12 - Commitments and Contingencies (Details) (USD $)
3 Months Ended
Mar. 30, 2014
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]        
Product Warranty Accrual $ 1,358,000     $ 1,439,000
Product Warranty Expense 67,000   65,000  
Period of Extended Product Warranty One   3 years    
Period of Extended Product Warranty Two 5 years      
Extended Product Warranty Accrual 1,288,000     1,567,000
Purchase Obligation 8,689,000      
Letters of Credit Outstanding, Amount $ 806,000