Business Description and Summary of Significant Accounting Policies (Detail Textuals) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for doubtful accounts	$ 180,000		$ 170,000
Inventory reserve	1,465,000		1,543,000
Interest paid	27,000	$ 25,000
Warranty reserve	$ 467,000		$ 428,000
Accounting standards update 2016-02 (Topic 842)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Description of one lease of equipment at annual payment	Company has one lease of equipment at an annual payment of less than $2,000
Threshold limit of annual payment of one lease equipment	$ 2,000