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Note 2 - Revenue from Contracts with Customers 1 (Details Textual) - USD ($)
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Revenue, Remaining Performance Obligation, Amount $ 15,867,000    
Contract with Customer, Asset, Net, Current, Total 839,000 $ 825,000 $ 0
Contract with Customer, Liability, Current 1,121,000    
Other Current Assets [Member]      
Contract with Customer, Asset, Net, Current, Total 839,000 825,000  
Accrued Liabilities [Member]      
Contract with Customer, Liability, Current $ 8,369,000 $ 1,509,000