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Note 2 - Revenue Recognition (Details Textual) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Contract with Customer, Liability, Revenue Recognized $ 2,883 $ 2,231
Deferred Revenue [Member]    
Contract with Customer, Liability, Revenue Recognized $ 1,500 $ 1,300