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Summary of significant accounting policies, Revenue recognition - Disaggregation of revenue (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Summary of significant accounting policies [Abstract]
Term of free maintenance upon completion of software installation									1 year
Disaggregation of revenue [Abstract]
Net sales	$ 11,123	$ 10,637	$ 9,325	$ 8,301	$ 7,763	$ 7,300	$ 5,285	$ 10,247	$ 39,386	$ 30,595
United States [Member]
Disaggregation of revenue [Abstract]
Net sales									32,400	24,733
International [Member]
Disaggregation of revenue [Abstract]
Net sales									6,986	5,862
Food Service Technology [Member]
Disaggregation of revenue [Abstract]
Net sales									12,625	7,734
Food Service Technology [Member] | United States [Member]
Disaggregation of revenue [Abstract]
Net sales									11,738	6,956
Food Service Technology [Member] | International [Member]
Disaggregation of revenue [Abstract]
Net sales									887	778
POS Automation [Member]
Disaggregation of revenue [Abstract]
Net sales									4,825	3,770
POS Automation [Member] | United States [Member]
Disaggregation of revenue [Abstract]
Net sales									4,817	3,763
POS Automation [Member] | International [Member]
Disaggregation of revenue [Abstract]
Net sales									8	7
Casino and Gaming [Member]
Disaggregation of revenue [Abstract]
Net sales									15,302	10,979
Casino and Gaming [Member] | United States [Member]
Disaggregation of revenue [Abstract]
Net sales									10,173	6,852
Casino and Gaming [Member] | International [Member]
Disaggregation of revenue [Abstract]
Net sales									5,129	4,127
Lottery [Member]
Disaggregation of revenue [Abstract]
Net sales										817
Lottery [Member] | United States [Member]
Disaggregation of revenue [Abstract]
Net sales										817
Lottery [Member] | International [Member]
Disaggregation of revenue [Abstract]
Net sales										0
Printrex [Member]
Disaggregation of revenue [Abstract]
Net sales									631	300
Printrex [Member] | United States [Member]
Disaggregation of revenue [Abstract]
Net sales									171	83
Printrex [Member] | International [Member]
Disaggregation of revenue [Abstract]
Net sales									460	217
TransAct Services Group [Member]
Disaggregation of revenue [Abstract]
Net sales									6,003	6,995
TransAct Services Group [Member] | United States [Member]
Disaggregation of revenue [Abstract]
Net sales									5,501	6,262
TransAct Services Group [Member] | International [Member]
Disaggregation of revenue [Abstract]
Net sales									$ 502	$ 733

X

- Definition

Period the customer receives free maintenance upon completion of EPICENTRAL installation, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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