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Note 2 - Revenue Recognition (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Contract with Customer, Liability, Revenue Recognized $ 526 $ 601
Receivables, Net [Member]    
Contract with Customer, Asset, Net, Current, Total 44 0
Deferred Revenue [Member]    
Contract with Customer, Liability, Revenue Recognized $ 497 $ 314