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Note 4 - Revenue from Contracts with Customers (Details Textual) - USD ($)
3 Months Ended
Apr. 01, 2018
Apr. 02, 2017
Jan. 01, 2018
Revenue, Remaining Performance Obligation, Amount $ 6,211,000    
Contract with Customer, Liability, Revenue Recognized 727,000 $ 250,000  
Other Current Assets [Member]      
Contract with Customer, Asset, Net, Current, Total 1,331,000   $ 825,000
Accrued Liabilities [Member]      
Contract with Customer, Liability, Current $ 1,268,000   $ 1,509,000