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Note 1 - Summary of Significant Accounting Policies (Details Textual)
$ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Contract with Customer, Liability, Current $ 1,935 $ 1,373
Number of Reportable Segments 1  
Unbilled Receivables, Current $ 21,437 $ 28,337