Business Segment Data (Details) - Business Segment Data - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Revenues:
Revenues	$ 21,191,000	$ 23,567,000
Operating income (loss):
Operating Income (Loss)	(820,000)	(2,152,000)
Interest expense, net	(374,000)	(306,000)
(Loss) gain on foreign currency remeasurement	(45,000)	478,000
Gain on extinguishment of debt	462,000	314,000
Gain on sale/leaseback transaction	121,000
Warrant expense	(21,000)	(60,000)
Loss before income taxes	(677,000)	(1,726,000)
Income tax benefit (expense)	66,000	(23,000)
Net loss	(611,000)	(1,749,000)
Assets:
Assets	13,414,000	12,990,000
Depreciation and amortization:
Depreciation and amortization	1,774,000	2,443,000
Capital expenditures:
Capital expenditures	2,081,000	235,000
Operating Segments [Member]
Assets:
Assets	12,808,000	12,443,000
Corporate, Non-Segment [Member]
Operating income (loss):
Operating Income (Loss)	(3,276,000)	(3,386,000)
Assets:
Assets	606,000	547,000
Depreciation and amortization:
Depreciation and amortization	21,000	75,000
Capital expenditures:
Capital expenditures	4,000	5,000
Digital Display Sales [Member] | Operating Segments [Member]
Revenues:
Revenues	18,138,000	19,994,000
Operating income (loss):
Operating Income (Loss)	1,631,000	574,000
Assets:
Assets	8,753,000	6,955,000
Depreciation and amortization:
Depreciation and amortization	115,000	100,000
Capital expenditures:
Capital expenditures	2,033,000	169,000
Digital Display Lease And Maintenance [Member] | Operating Segments [Member]
Revenues:
Revenues	3,053,000	3,573,000
Operating income (loss):
Operating Income (Loss)	825,000	660,000
Assets:
Assets	4,055,000	5,488,000
Depreciation and amortization:
Depreciation and amortization	1,638,000	2,268,000
Capital expenditures:
Capital expenditures	$ 44,000	$ 61,000