Leases (Narrative) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) item	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Lessee, Lease, Description [Line Items]
Incremental borrowing rates terms, discount rates	5 years
Operating Lease, Payments | $	$ 609	$ 507
ROU asset | $	6,115		$ 6,701
Lease liability | $	$ 6,274
Minnesota [Member]
Lessee, Lease, Description [Line Items]
Number of leased facilities	3
California [Member]
Lessee, Lease, Description [Line Items]
Number of leased facilities	1
Illinois [Member]
Lessee, Lease, Description [Line Items]
Number of leased facilities	1
Singapore [Member]
Lessee, Lease, Description [Line Items]
Number of leased facilities	1
Indonesia [Member]
Lessee, Lease, Description [Line Items]
Number of leased facilities	1
ROU asset | $	$ 103
Lease liability | $	$ 72
Germany [Member]
Lessee, Lease, Description [Line Items]
Number of leased facilities	1
Lease Expiration In 2022 [Member] | Minnesota [Member]
Lessee, Lease, Description [Line Items]
Number of leased facilities	2
Lease Expiration In 2023 [Member] | Minnesota [Member]
Lessee, Lease, Description [Line Items]
Number of leased facilities	1
Minimum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	1 year
Lessee, Operating Lease, Renewal Term	1 year
Maximum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Renewal Term	5 years