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Note 3 - Balance Sheet Components (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 01, 2020
Dec. 31, 2019
Unbilled Receivables, Current $ 9,400     $ 7,400
Unbilled Receivables, Not Expected to be Billed and Collected in Next Twelve Months 4,100   $ 2,800  
Construction in Progress, Gross 17,700     16,600
Depreciation, Depletion and Amortization, Nonproduction, Total 1,700 $ 1,300    
Goodwill, Ending Balance 2,293     2,293
Finite-Lived Intangible Assets, Net, Ending Balance $ 5,904     $ 6,221
Finite-Lived Intangible Assets, Remaining Amortization Period (Year) 6 years      
Amortization of Intangible Assets, Total $ 300 $ 300    
Impairment of Intangible Assets, Finite-lived $ 0