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Note C - Revenue from Contracts with Customers (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2021
Jun. 30, 2021
Revenue, Remaining Performance Obligation, Amount   $ 0
Contract with Customer, Liability, Revenue Recognized   3,500
Capitalized Contract Cost, Net, Total   $ 1,500
Capitalized Contract Cost, Impairment Loss $ 0