Goodwill and Intangible Assets (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Goodwill
Amortization expense	76,000	$ 200,000
Publishing [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets excluding goodwill	0
Goodwill	0
Marketing Services [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense	76,000	$ 200,000
Developed Technology [Member] | Marketing Services [Member]
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangibles	$ 1,520,000
Definite-lived intangibles, useful life	5 years
Net carrying value that will be fully expensed by end of 2019	$ 228,000