Business Description and Summary of Significant Accounting Policies (Detail Textuals) - USD ($)	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Accounting Policies [Abstract]
Allowance for doubtful accounts	$ 149,000		$ 77,000
Inventory reserve	1,556,000		1,513,000
Income taxes paid	165,000	$ 644,000
Interest paid	56,000	$ 54,000
Equipment received but not placed in service	508,000
Reclassification of deferred tax liability from current to noncurrent	$ 661,000		$ 661,000