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Note 2 - Revenue Recognition (Details Textual)
12 Months Ended
Dec. 31, 2018
USD ($)
Contract with Customer, Liability, Revenue Recognized $ 4,727,000
Receivables, Net [Member]  
Contract with Customer, Asset, Net, Current, Total 65,000
Deferred Revenue [Member]  
Contract with Customer, Liability, Revenue Recognized $ 615,000