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Note 2 - Revenue Recognition (Details Textual) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Contract with Customer, Liability, Revenue Recognized $ 2,231 $ 2,216
Deferred Revenue [Member]    
Contract with Customer, Liability, Revenue Recognized $ 1,300 $ 527