Business Description and Summary of Significant Accounting Policies (Detail Textuals) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Accounting Policies [Abstract]
Allowance for doubtful accounts	$ 154,000	$ 77,000
Inventory reserve	1,601,000	1,513,000
Income taxes paid	73,000	684,000
Interest paid	77,000	$ 73,000
Reclassification of deferred tax liability from current to noncurrent	$ 661,000