Schedule of Restatement Items on Consolidated Statement of Operations (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenue:
Total Revenue		$ 79,400		$ 70,500		$ 144,300	$ 130,800
Cost of Sales
Cost of Service	[1]	(20,500)		(17,800)		(35,500)	(34,600)
Cost of Product sales	[1]	(8,400)		(4,600)		(15,100)	(7,100)
Selling, general and administrative expenses		(26,600)		(25,700)		(55,800)	(48,900)
Acquisition and integration related transaction expenses							(200)
Depreciation and amortization		(10,100)		(10,200)		(19,500)	(20,900)
Net operating income		13,800		12,200		18,400	19,100
Other expense
Interest expense, net		(7,300)		(5,900)		(13,600)	(12,400)
Gain on disposal of business							900
Other finance income (expense)		100		300		200	600
Total other expense, net		(7,200)		(5,600)		(13,400)	(10,900)
Net income before income taxes		6,600		6,600		5,000	8,200
Income tax (expense) benefit		(1,000)		(200)		(800)	(300)
Net income		5,600	$ (1,400)	6,400	$ 1,500	4,200	7,900
Other comprehensive income:
Foreign currency translation (loss) gain		(2,700)	$ (2,900)	9,000	$ 3,500	(5,600)	12,500
Reclassification of loss on hedging instrument to comprehensive income		100		200		300	400
Actuarial (losses) gains on pension plan		300		(800)		500	(700)
Other comprehensive (loss) income		(2,300)		8,400		(4,800)	12,200
Comprehensive income (loss)		$ 3,300		$ 14,800		$ (600)	$ 20,100
Net income per common share - basic		$ 0.20		$ 0.23		$ 0.15	$ 0.28
Net income per common share - diluted		$ 0.19		$ 0.22		$ 0.14	$ 0.27
Weighted average number of shares outstanding during the year - basic		28,186,725		28,426,248		28,081,041	28,431,576
Weighted average number of shares outstanding during the year - diluted		29,073,078		29,349,718		29,023,288	29,446,526
Stock-based compensation expense included in:
Selling, general and administrative expenses		$ (3,100)		$ (2,600)		$ (6,100)	$ (5,400)
Service [Member]
Revenue:
Total Revenue		67,500		64,100		125,000	120,100
Product Sales [Member]
Revenue:
Total Revenue		11,900		6,400		19,300	10,700
Previously Reported [Member]
Revenue:
Total Revenue		80,400		71,300		146,400	131,900
Cost of Sales
Cost of Service		(13,400)		(11,700)		(24,300)	(23,500)
Cost of Product sales		(9,800)		(4,400)		(15,600)	(6,500)
Selling, general and administrative expenses		(34,400)		(31,900)		(68,700)	(61,500)
Acquisition and integration related transaction expenses				(100)			(200)
Depreciation and amortization		(10,400)		(9,800)		(19,300)	(19,900)
Net operating income		12,400		13,400		18,500	20,300
Other expense
Interest expense, net		(7,300)		(6,000)		(13,600)	(12,500)
Gain on disposal of business							900
Other finance income (expense)		100		300		200	600
Total other expense, net		(7,200)		(5,700)		(13,400)	(11,000)
Net income before income taxes		5,200		7,700		5,100	9,300
Income tax (expense) benefit		(1,100)		(200)		(1,200)	(300)
Net income		4,100		7,500		3,900	9,000
Other comprehensive income:
Foreign currency translation (loss) gain		(1,600)		5,800		(3,300)	8,200
Reclassification of loss on hedging instrument to comprehensive income		100		200		300	400
Actuarial (losses) gains on pension plan		(300)		2,600		1,700	3,300
Other comprehensive (loss) income		(1,800)		8,600		(1,300)	11,900
Comprehensive income (loss)		$ 2,300		$ 16,100		$ 2,600	$ 20,900
Net income per common share - basic		$ 0.16		$ 0.28		$ 0.15	$ 0.34
Net income per common share - diluted		$ 0.14		$ 0.26		$ 0.13	$ 0.31
Weighted average number of shares outstanding during the year - basic		26,267,215		26,826,014		26,211,589	26,838,339
Weighted average number of shares outstanding during the year - diluted		29,041,781		29,262,690		28,992,987	29,375,570
Stock-based compensation expense included in:
Selling, general and administrative expenses		$ (3,100)		$ (2,600)		$ (6,100)	$ (5,400)
Previously Reported [Member] | Service [Member]
Revenue:
Total Revenue		68,100		64,800		126,400	121,800
Previously Reported [Member] | Product Sales [Member]
Revenue:
Total Revenue		12,300		6,500		20,000	10,100
Revision of Prior Period, Reclassification, Adjustment [Member]
Revenue:
Total Revenue		(1,000)		(800)		(2,100)	(1,100)
Cost of Sales
Cost of Service		(7,100)		(6,100)		(11,200)	(11,100)
Cost of Product sales		1,400		(200)		500	(600)
Selling, general and administrative expenses		7,800		6,200		12,900	12,600
Acquisition and integration related transaction expenses				100
Depreciation and amortization		300		(100)		(200)	(400)
Net operating income		1,400		(900)		(100)	(600)
Other expense
Interest expense, net				100			100
Gain on disposal of business
Other finance income (expense)
Total other expense, net				100			100
Net income before income taxes		1,400		(800)		(100)	(500)
Income tax (expense) benefit		100				400
Net income		1,500		(800)		300	(500)
Other comprehensive income:
Foreign currency translation (loss) gain		(1,100)		3,200		(2,300)	4,300
Reclassification of loss on hedging instrument to comprehensive income
Actuarial (losses) gains on pension plan		600		(3,400)		(1,200)	(4,000)
Other comprehensive (loss) income		(500)		(200)		(3,500)	300
Comprehensive income (loss)		$ 1,000		$ (1,000)		$ (3,200)	$ (200)
Net income per common share - basic		$ 0.04		$ (0.04)			$ (0.03)
Net income per common share - diluted		$ 0.05				$ 0.01	$ (0.02)
Weighted average number of shares outstanding during the year - basic		1,919,510		1,600,234		1,869,452	1,593,237
Weighted average number of shares outstanding during the year - diluted		31,297		87,028		30,301	70,956
Stock-based compensation expense included in:
Selling, general and administrative expenses
Revision of Prior Period, Reclassification, Adjustment [Member] | Service [Member]
Revenue:
Total Revenue		$ (600)		(700)		$ (1,400)	(1,700)
Revision of Prior Period, Reclassification, Adjustment [Member] | Product Sales [Member]
Revenue:
Total Revenue		$ (400)		(100)		$ (700)	600
Previous Revision [Member]
Revenue:
Total Revenue
Cost of Sales
Cost of Service
Cost of Product sales
Selling, general and administrative expenses
Acquisition and integration related transaction expenses
Depreciation and amortization				(300)			(600)
Net operating income				(300)			(600)
Other expense
Interest expense, net
Gain on disposal of business
Other finance income (expense)
Total other expense, net
Net income before income taxes				(300)			(600)
Income tax (expense) benefit
Net income				(300)			(600)
Other comprehensive income:
Foreign currency translation (loss) gain
Reclassification of loss on hedging instrument to comprehensive income
Actuarial (losses) gains on pension plan
Other comprehensive (loss) income
Comprehensive income (loss)				$ (300)			$ (600)
Net income per common share - basic				$ (0.01)			$ (0.03)
Net income per common share - diluted				$ (0.04)			$ (0.02)
Weighted average number of shares outstanding during the year - basic
Weighted average number of shares outstanding during the year - diluted
Stock-based compensation expense included in:
Selling, general and administrative expenses
Previous Revision [Member] | Service [Member]
Revenue:
Total Revenue
Previous Revision [Member] | Product Sales [Member]
Revenue:
Total Revenue

[1] Excluding depreciation and amortization