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 9 Months Ended
Sep. 30, 2018
Oct. 01, 2017
Sep. 30, 2018
Oct. 01, 2017
Jan. 01, 2018
Revenue, Remaining Performance Obligation, Amount $ 17,364,000   $ 17,364,000    
Contract with Customer, Liability, Revenue Recognized 543,000 $ 1,545,000 1,614,000 $ 2,889,000  
Other Current Assets [Member]          
Contract with Customer, Asset, Net, Current, Total 1,826,000   1,826,000   $ 825,000
Accrued Liabilities [Member]          
Contract with Customer, Liability, Current $ 4,659,000   $ 4,659,000   $ 1,509,000