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Note 5 - BALANCE SHEET COMPONENTS - Other (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Unbilled Receivables, Current $ 5.7   $ 5.7   $ 7.2
Unbilled Receivables, Not Expected to be Billed and Collected in Next Twelve Months 1.6   1.6   2.0
Depreciation, Depletion and Amortization, Nonproduction, Total 1.6 $ 1.7 3.3 $ 3.4  
Impairment of goodwill 0.0   $ 0.0    
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (Year)     7 years    
Amortization of Intangible Assets, Total 0.9 $ 0.3 $ 1.7 $ 0.6  
DFI Test Equipment [Member]          
Construction in Progress, Gross $ 20.9   $ 20.9   $ 18.9