XML 52 R41.htm IDEA: XBRL DOCUMENT v3.10.0.1
Note 4 - Revenue from Contracts with Customers 1 (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jul. 01, 2018
Jul. 02, 2017
Jul. 01, 2018
Jul. 02, 2017
Jan. 01, 2018
Revenue, Remaining Performance Obligation, Amount $ 11,677,000   $ 11,677,000    
Contract with Customer, Liability, Revenue Recognized 344,000 $ 1,094,000 1,071,000 $ 1,344,000  
Other Current Assets [Member]          
Contract with Customer, Asset, Net, Current, Total 1,851,000   1,851,000   $ 825,000
Accrued Liabilities [Member]          
Contract with Customer, Liability, Current $ 1,691,000   $ 1,691,000   $ 1,509,000