Condensed Consolidated Balance Sheets (Parenthetical) $ in Thousands	Mar. 31, 2022 USD ($) shares	Mar. 31, 2022 € / shares	Dec. 31, 2021 USD ($) shares	Dec. 31, 2021 € / shares
Assets
Accounts receivable, allowance | $	$ 361		$ 368
Property, plant and equipment, accumulated depreciation | $	(4,212)		(3,998)
Intangible assets, accumulated amortization | $	$ (15,799)		$ (15,522)
Shareholders' Equity:
Common stock, nominal value (in Euro per share) | € / shares		€ 1.00		€ 1.00
Common stock, shares authorized (in shares)	3,521,005		3,521,005
Common stock, issued (in shares)	2,661,386		2,661,386
Common stock, outstanding (in shares)	2,617,397		2,617,397
Treasury stock, shares (in shares)	43,989