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Note C - Revenue from Contracts with Customers (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Revenue, Remaining Performance Obligation, Amount $ 0  
Contract with Customer, Liability, Revenue Recognized 4,500  
Capitalized Contract Cost, Net, Total 1,300 $ 1,900
Capitalized Contract Cost, Impairment Loss $ 0 $ 0