Condensed Consolidated Statement of Stockholders' Equity (unaudited) - USD ($) $ in Thousands	Cumulative Effect, Period of Adoption, Adjustment [Member] Common Stock [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Additional Paid-in Capital [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Retained Earnings [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Accumulated Foreign Currency Adjustment Attributable to Parent [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Parent [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Noncontrolling Interest [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Foreign Currency Adjustment Attributable to Parent [Member]	Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]	Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]	Parent [Member]	Noncontrolling Interest [Member]	Total
Balance (in shares) at Dec. 31, 2018										37,446,323
Balance at Dec. 31, 2018										$ 374	$ 267,317	$ (31,127)	$ (3,989)	$ (15)	$ (1,543)	$ 231,017	$ 45,356	$ 276,373
Issuance of common stock (in shares)										115,421
Issuance of common stock										$ 1	514	0	0	0	0	515	0	515
Share-based compensation expenses										0	425	0	0	0	0	425	0	425
Warrant expenses										0	0	0	0	0	0	0	0	0
Net income (loss)										0	0	(3,346)	0	0	0	(3,346)	189	(3,157)
Other comprehensive loss for the period										$ 0	0	0	567	(65)	90	592	86	678
Balance (in shares) at Mar. 31, 2019										37,561,744
Balance at Mar. 31, 2019										$ 375	268,256	(34,473)	(3,422)	(80)	(1,453)	229,203	45,631	$ 274,834
Balance (in shares) at Dec. 31, 2019										38,525,636								38,525,636
Balance at Dec. 31, 2019	$ 0	$ 413	$ (413)	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 385	276,827	(46,145)	(4,568)	475	(1,929)	225,045	46,739	$ 271,784
Issuance of common stock (in shares)										16,088
Issuance of common stock										$ 0	43	0	0	0	0	43	0	43
Share-based compensation expenses										0	291	0	0	0	0	291	0	291
Warrant expenses										0	278	0	0	0	0	278	0	278
Net income (loss)										0	0	(26,557)	0	0	0	(26,557)	576	(25,981)
Other comprehensive loss for the period										$ 0	0	0	(4,392)	(672)	233	(4,831)	163	$ (4,668)
Balance (in shares) at Mar. 31, 2020										38,541,724								38,541,724
Balance at Mar. 31, 2020										$ 385	$ 277,852	$ (73,115)	$ (8,960)	$ (197)	$ (1,696)	$ 194,269	$ 47,478	$ 241,747