Business Segment Information, Geographic Area (Details) - USD ($)		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues		$ 56,316,109	$ 51,851,159
Long-lived assets		2,427,479	2,115,316
United States [Member] | Reportable Geographical Components [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues		40,888,000	39,513,000
Long-lived assets		1,793,000	1,676,000
All Other (Foreign) Countries [Member] | Reportable Geographical Components [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	[1]	15,428,000	12,338,000
United Kingdom and The Netherlands [Member] | Reportable Geographical Components [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets		$ 634,000	$ 439,000

[1] No other (foreign) country accounts for 10% or more of the consolidated net sales.