Leases (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) item	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jan. 01, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Finance Lease, Weighted Average Discount Rate, Percent	5.56%
Finance Lease, Weighted Average Remaining Lease Term	1 year 4 months 24 days
Operating Lease, Weighted Average Discount Rate, Percent	5.25%
Operating Lease, Weighted Average Remaining Lease Term	3 years 1 month 6 days
Incremental borrowing rates terms, discount rates	5 years
Future minimum payments, 2019		$ 2,417
Future minimum payments, 2020		2,255
Future minimum payments, 2021		1,689
Future minimum payments, 2022		950
Future minimum payments, 2023		188
ROU asset	$ 4,372			$ 6,000
Lease liability	4,666			$ 6,000
Lease total expense	2,539
Engineering, Manufacturing, Sales And Administrative Facilities [Member]
Lessee, Lease, Description [Line Items]
Lease total expense		$ 2,327	$ 1,728
Continuing Operations [Member]
Lessee, Lease, Description [Line Items]
Lease liability	1,898
Non-cash increase of operating lease ROU assets	741
Non-cash increase of lease incentive other assets	140
Non-cash increase of lease liabilities	$ 881
Minnesota [Member]
Lessee, Lease, Description [Line Items]
Number of leased facilities | item	3
Minnesota [Member] | Lease Expiration In 2022 [Member]
Lessee, Lease, Description [Line Items]
Number of leased facilities | item	2
Minnesota [Member] | Lease Expiration In 2023 [Member]
Lessee, Lease, Description [Line Items]
Number of leased facilities | item	1
Illinois [Member]
Lessee, Lease, Description [Line Items]
Number of leased facilities | item	1
Singapore [Member]
Lessee, Lease, Description [Line Items]
Number of leased facilities | item	1
Indonesia [Member]
Lessee, Lease, Description [Line Items]
Number of leased facilities | item	1
ROU asset	$ 103
Lease liability	$ 72
Germany [Member]
Lessee, Lease, Description [Line Items]
Number of leased facilities | item	1
Minimum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	1 year
Minimum [Member] | Foreign Countries [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	1 year
Maximum [Member] | Foreign Countries [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	5 years