Note 10 - Leases (Details Textual) $ in Thousands							3 Months Ended	12 Months Ended
	Aug. 16, 2021 USD ($)	Jul. 19, 2021 USD ($)	Oct. 01, 2020 USD ($)	Sep. 22, 2020 USD ($) ft²	Jul. 19, 2020 USD ($)	Jan. 23, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 21, 2021 USD ($)	Nov. 30, 2021 USD ($)
Operating Lease, Right-of-Use Asset, Amortization Expense								$ 1,039	$ 1,294
Operating Lease, Impairment Loss							$ 612	0	612
Incremental Sublease Income Above Impairment Charge		$ 350			$ 350
Operating Lease, Right-of-Use Asset							6,387	5,919	6,387
Operating Lease, Liability, Total								$ 6,619
Lease Facility in Fremont, California [Member]
Lessee, Operating Lease, Term of Contract (Month)	38 months 15 days
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 202
Lease Facility in Netherlands [Member]
Lessee, Operating Lease, Term of Contract (Month)											37 months
Operating Lease, Right-of-Use Asset											$ 252
Operating Lease, Liability, Total											$ 252
Automobile Leases [Member]
Lessee, Operating Lease, Term of Contract (Month)								48 months
Operating Lease, Right-of-Use Asset							91	$ 54	91
Operating Lease, Liability, Total							91	54	91
Increase in Operating Lease Liabilities and Right-of-Use Assets, Non-cash							91
Facility Lease From Acquisition of Acculogic [Member]
Operating Lease, Right-of-Use Asset								76		$ 76,000
Operating Lease, Liability, Total								78		$ 78,000
Lease Agreement, EMS Facility in Fremont, California [Member]
Operating Lease, Right-of-Use Asset							1,176	202	1,176
Operating Lease, Liability, Total							1,176	$ 202	1,176
Lessee, Operating Lease, Renewal Term (Month)						61 months
Increase in Operating Lease Liabilities and Right-of-Use Assets, Non-cash						$ 1,176
Lease Agreement, EMS Facility in Mt. Laurel, New Jersey [Member]
Operating Lease, Right-of-Use Asset							2,051		2,051
Operating Lease, Liability, Total							2,051		2,051
Lessee, Operating Lease, Renewal Term (Month)				120 months
Increase in Operating Lease Liabilities and Right-of-Use Assets, Non-cash				$ 2,051
Area of Real Estate Property (Square Foot) | ft²				33,650
Lease Agreement, Ambrell’s Netherlands Facility [Member]
Operating Lease, Right-of-Use Asset							133		133
Operating Lease, Liability, Total							$ 133		$ 133
Lessee, Operating Lease, Renewal Term (Month)			3 years
Increase in Operating Lease Liabilities and Right-of-Use Assets, Non-cash			$ 133