Note 4 - BALANCE SHEET COMPONENTS - Other (Details) - USD ($)	3 Months Ended			9 Months Ended
	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Unbilled Receivables, Current	$ 9,800,000	$ 11,800,000		$ 9,800,000
Unbilled Receivables, Not Expected to be Billed and Collected in Next Twelve Months	1,000,000.0	1,300,000		1,000,000.0
Depreciation, Depletion and Amortization, Nonproduction, Total	1,400,000		$ 1,500,000	4,200,000	$ 4,800,000
Impairment of Intangible Assets, Finite-lived	0		0	0	0
Goodwill	14,123,000	14,123,000		14,123,000
Impairment of goodwill	0		0	0	0
Amortization of Intangible Assets, Total	871,000		770,000	$ 2,605,000	2,467,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (Year)				6 years 7 months 6 days
Write-down in value of property and equipment		3,200,000
Cost of Sales [Member]
Amortization of Intangible Assets, Total	553,000		456,000	$ 1,659,000	1,525,000
Costs and Expenses [Member]
Amortization of Intangible Assets, Total	318,000		$ 314,000	946,000	$ 942,000
DFI Test Equipment [Member]
Construction in Progress, Gross	$ 20,100,000	$ 20,000,000.0		$ 20,100,000