Segment and Related Information, Reconciliation of Segment Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Identifiable assets by geographic area [Abstract]
Identifiable assets	$ 123,207	$ 124,049
Goodwill by business segment [Abstract]
Goodwill	11,051	11,051
Restaurant/Retail [Member]
Goodwill by business segment [Abstract]
Goodwill	10,300	10,300
Government [Member]
Goodwill by business segment [Abstract]
Goodwill	700	700
Other [Member]
Identifiable assets by geographic area [Abstract]
Identifiable assets	28,041	29,873
Reportable Segments [Member] | Restaurant/Retail [Member]
Identifiable assets by geographic area [Abstract]
Identifiable assets	87,553	87,672
Goodwill by business segment [Abstract]
Goodwill	10,315	10,315
Reportable Segments [Member] | Government [Member]
Identifiable assets by geographic area [Abstract]
Identifiable assets	7,613	6,504
Goodwill by business segment [Abstract]
Goodwill	736	736
Reportable Geographical Components [Member] | United States [Member]
Identifiable assets by geographic area [Abstract]
Identifiable assets	107,293	110,369
Reportable Geographical Components [Member] | Other Countries [Member]
Identifiable assets by geographic area [Abstract]
Identifiable assets	$ 15,914	$ 13,680