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Note 11 - Commitments and Contingencies (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Jul. 01, 2012
Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]        
Product Warranty Accrual $ 1,034,000 $ 1,034,000   $ 1,111,000
Product Warranty Expense   136,000 221,000  
Period of Extended Product Warranty One 3 years      
Period of Extended Product Warranty Two 5 years      
Extended Product Warranty Accrual 2,187,000 2,187,000   2,607,000
Purchase Obligation 7,436,000 7,436,000    
Letters of Credit Outstanding, Amount $ 806,000 $ 806,000