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, 2019										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)										1,684,663
Issuance of common stock										$ 16	7,993	0	0	0	0	8,009	0	8,009
Warrant expenses										0	763	0	0	0	0	763	0	763
Net income (loss)										0	0	(31,774)	0	0	0	(31,774)	605	(31,169)
Other comprehensive loss for the period										0	0	0	(3,665)	(680)	(1,006)	(5,351)	(1,624)	(6,975)
Share-based compensation expenses										$ 0	209	0	0	0	0	209	0	209
Balance (in shares) at Jun. 30, 2020										40,210,299
Balance at Jun. 30, 2020										$ 401	286,205	(78,332)	(8,233)	(205)	(2,935)	196,901	45,720	242,621
Balance (in shares) at Dec. 31, 2019										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
Balance (in shares) at Dec. 31, 2020										40,453,462								40,453,462
Balance at Dec. 31, 2020										$ 405	288,700	(85,543)	(4,529)	(8)	(2,749)	196,276	50,606	$ 246,882
Balance (in shares) at Mar. 31, 2020										38,541,724
Balance at Mar. 31, 2020										$ 385	277,852	(73,115)	(8,960)	(197)	(1,696)	194,269	47,478	241,747
Issuance of common stock (in shares)										1,668,575
Issuance of common stock										$ 16	7,950	0	0	0	0	7,966	0	7,966
Share-based compensation expenses										0	(82)	0	0	0	0	(82)	0	(82)
Warrant expenses										0	485	0	0	0	0	485	0	485
Net income (loss)										0	0	(5,217)	0	0	0	(5,217)	29	(5,188)
Other comprehensive loss for the period										$ 0	0	0	727	(8)	(1,239)	(520)	(1,787)	(2,307)
Balance (in shares) at Jun. 30, 2020										40,210,299
Balance at Jun. 30, 2020										$ 401	286,205	(78,332)	(8,233)	(205)	(2,935)	196,901	45,720	$ 242,621
Balance (in shares) at Dec. 31, 2020										40,453,462								40,453,462
Balance at Dec. 31, 2020										$ 405	288,700	(85,543)	(4,529)	(8)	(2,749)	196,276	50,606	$ 246,882
Issuance of common stock (in shares)										342,717
Issuance of common stock										$ 3	1,280	0	0	0	0	1,283	0	1,283
Warrant expenses										0	830	0	0	0	0	830	0	830
Net income (loss)										0	0	(5,270)	0	0	0	(5,270)	3,535	(1,735)
Other comprehensive loss for the period										0	0	0	(1,968)	8	(352)	(2,312)	(69)	(2,381)
Share-based compensation expenses										$ 0	591	0	0	0	0	591	0	$ 591
Balance (in shares) at Jun. 30, 2021										40,796,179								40,796,179
Balance at Jun. 30, 2021										$ 408	291,401	(90,813)	(6,497)	0	(3,101)	191,398	54,072	$ 245,470
Balance (in shares) at Mar. 31, 2021										40,781,804
Balance at Mar. 31, 2021										$ 408	290,646	(97,698)	(5,621)	0	(3,064)	184,671	52,837	237,508
Issuance of common stock (in shares)										14,375
Issuance of common stock										$ 0	39	0	0	0	0	39	0	39
Share-based compensation expenses										0	311	0	0	0	0	311	0	311
Warrant expenses										0	405	0	0	0	0	405	0	405
Net income (loss)										0	0	6,885	0	0	0	6,885	1,235	8,120
Other comprehensive loss for the period										$ 0	0	0	(876)	0	(37)	(913)	0	$ (913)
Balance (in shares) at Jun. 30, 2021										40,796,179								40,796,179
Balance at Jun. 30, 2021										$ 408	$ 291,401	$ (90,813)	$ (6,497)	$ 0	$ (3,101)	$ 191,398	$ 54,072	$ 245,470