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Note 5 - Revenue from Contracts with Customers 1 (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jul. 01, 2018
Jun. 30, 2019
Jul. 01, 2018
Dec. 31, 2018
Revenue, Remaining Performance Obligation, Amount $ 23,557,000   $ 23,557,000    
Contract with Customer, Liability, Revenue Recognized 2,190,000 $ 344,000 3,234,000 $ 1,071,000  
Other Current Assets [Member]          
Contract with Customer, Asset, Net, Current, Total 747,000   747,000   $ 839,000
Accrued Liabilities [Member]          
Contract with Customer, Liability, Current $ 8,669,000   $ 8,669,000   $ 8,369,000