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Note 6 - Revenue from Contracts with Customers 1 (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2019
Apr. 01, 2018
Dec. 31, 2018
Revenue, Remaining Performance Obligation, Amount $ 13,269,000    
Contract with Customer, Liability, Revenue Recognized 1,344,000 $ 727,000  
Other Current Assets [Member]      
Contract with Customer, Asset, Net, Current, Total 554,000   $ 839,000
Accrued Liabilities [Member]      
Contract with Customer, Liability, Current $ 8,733,000   $ 8,369,000