CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]	Total	Series A Convertible Preferred Stock [Member]
BALANCE at Dec. 31, 2018	$ 141,377	$ 29,484	$ (82,860)	$ (44,073)	$ (4,062)	$ 39,866	$ 0
BALANCE (in shares) at Dec. 31, 2018	30,552,333						0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 0	0	0	(5,467)	0	(5,467)	$ 0
Employee pension plan adjustments	0	0	0	0	154	154	0
Stock-based compensation expense
Restricted stock	$ 0	52	0	0	0	52	$ 0
Restricted stock (in shares)	478,853						0
Net share settlement for equity-based compensation	$ 0	(18)	0	0	0	(18)	$ 0
Net share settlement for equity-based compensation (in shares)	(5,518)						0
BALANCE at Mar. 31, 2019	$ 141,377	29,518	(82,860)	(49,540)	(3,908)	34,587	$ 0
BALANCE (in shares) at Mar. 31, 2019	31,025,668						0
BALANCE at Dec. 31, 2018	$ 141,377	29,484	(82,860)	(44,073)	(4,062)	39,866	$ 0
BALANCE (in shares) at Dec. 31, 2018	30,552,333						0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)						(7,192)
Derivative qualifying as cash flow hedge						0
BALANCE at Sep. 30, 2019	$ 141,377	29,927	(82,860)	(51,264)	(3,600)	33,580	$ 0
BALANCE (in shares) at Sep. 30, 2019	31,142,251						0
BALANCE at Mar. 31, 2019	$ 141,377	29,518	(82,860)	(49,540)	(3,908)	34,587	$ 0
BALANCE (in shares) at Mar. 31, 2019	31,025,668						0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 0	0	0	(3,064)	0	(3,064)	$ 0
Employee pension plan adjustments	0	0	0	0	154	154	0
Stock-based compensation expense
Restricted stock	$ 0	191	0	0	0	191	$ 0
Restricted stock (in shares)	116,583						0
Net share settlement for equity-based compensation	$ 0	0	0	0	0	0	$ 0
Net share settlement for equity-based compensation (in shares)	0						0
BALANCE at Jun. 30, 2019	$ 141,377	29,709	(82,860)	(52,604)	(3,754)	31,868	$ 0
BALANCE (in shares) at Jun. 30, 2019	31,142,251						0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 0	0	0	1,340	0	1,340	$ 0
Employee pension plan adjustments	0	0	0	0	154	154	0
Derivative qualifying as cash flow hedge						0
Stock-based compensation expense
Restricted stock	$ 0	218	0	0	0	218	$ 0
Restricted stock (in shares)	0						0
Net share settlement for equity-based compensation	$ 0	0	0	0	0	0	$ 0
Net share settlement for equity-based compensation (in shares)	0						0
BALANCE at Sep. 30, 2019	$ 141,377	29,927	(82,860)	(51,264)	(3,600)	33,580	$ 0
BALANCE (in shares) at Sep. 30, 2019	31,142,251						0
BALANCE at Dec. 31, 2019	$ 141,377	30,145	(82,860)	(42,058)	(3,456)	43,148	$ 11,982
BALANCE (in shares) at Dec. 31, 2019	31,142,251						12,700
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 0	0	0	(1,750)	0	(1,750)	$ 0
Employee pension plan adjustments	0	0	0	0	140	140	0
Derivative qualifying as cash flow hedge	0	0	0	0	(748)	(748)	0
Stock-based compensation expense
Restricted stock	$ 0	291	0	0	0	291	$ 0
Restricted stock (in shares)	1,191,262						0
Net share settlement for equity-based compensation	$ 0	(172)	0	0	0	(172)	$ 0
Net share settlement for equity-based compensation (in shares)	(58,451)						0
BALANCE at Mar. 31, 2020	$ 141,377	30,264	(82,860)	(43,808)	(4,064)	40,909	$ 11,982
BALANCE (in shares) at Mar. 31, 2020	32,275,062						12,700
BALANCE at Dec. 31, 2019	$ 141,377	30,145	(82,860)	(42,058)	(3,456)	43,148	$ 11,982
BALANCE (in shares) at Dec. 31, 2019	31,142,251						12,700
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)						2,545
Derivative qualifying as cash flow hedge						(786)
BALANCE at Sep. 30, 2020	$ 141,377	30,113	(82,860)	(39,513)	(3,822)	45,295	$ 11,982
BALANCE (in shares) at Sep. 30, 2020	32,386,870						12,700
BALANCE at Mar. 31, 2020	$ 141,377	30,264	(82,860)	(43,808)	(4,064)	40,909	$ 11,982
BALANCE (in shares) at Mar. 31, 2020	32,275,062						12,700
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 0	0	0	783	0	783	$ 0
Employee pension plan adjustments	0	0	0	0	140	140	0
Derivative qualifying as cash flow hedge	0	0	0	0	(95)	(95)	0
Stock-based compensation expense
Restricted stock	$ 0	325	0	0	0	325	$ 0
Restricted stock (in shares)	111,376						0
Net share settlement for equity-based compensation	$ 0	0	0	0	0	0	$ 0
Net share settlement for equity-based compensation (in shares)	0						0
BALANCE at Jun. 30, 2020	$ 141,377	30,589	(82,860)	(43,025)	(4,019)	42,062	$ 11,982
BALANCE (in shares) at Jun. 30, 2020	32,386,438						12,700
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 0	0	0	3,512	0	3,512	$ 0
Preferred stock dividends	0	(1,074)	0	0	0	(1,074)	0
Employee pension plan adjustments	0	0	0	0	140	140	0
Derivative qualifying as cash flow hedge	0	0	0	0	57	57	0
Stock-based compensation expense
Restricted stock	$ 0	670	0	0	0	670	$ 0
Restricted stock (in shares)	17,096						0
Net share settlement for equity-based compensation	$ 0	(72)	0	0	0	(72)	$ 0
Net share settlement for equity-based compensation (in shares)	(16,664)						0
BALANCE at Sep. 30, 2020	$ 141,377	$ 30,113	$ (82,860)	$ (39,513)	$ (3,822)	$ 45,295	$ 11,982
BALANCE (in shares) at Sep. 30, 2020	32,386,870						12,700