Note 8 - Leases - Lease Modifications (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Lease Agreement, EMS Facility in Fremont, California [Member]
Non-cash increases in operating lease liabilites and ROU assets		$ 1,176
Lease Agreement, Ambrell’s U.K [Member]
Non-cash decreases in operating lease liabilites and ROU assets			$ (486)
Lease Agreement, EMS Facility in Mt. Laurel, New Jersey [Member]
Non-cash increases in operating lease liabilites and ROU assets		$ 2,051
Lease for Facility in Mansfield, Massachusetts [Member]
Non-cash increases in operating lease liabilites and ROU assets			1,811
Lease Agreement, Ambrell’s Netherlands Facility [Member]
Non-cash decreases in operating lease liabilites and ROU assets	$ (48)		$ (48)