Business Description and Summary of Significant Accounting Policies (Detail Textuals) - USD ($)	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for doubtful accounts	$ 144,000		$ 170,000
Inventory reserve	1,539,000		1,543,000
Interest paid	57,000	$ 52,000
Warranty reserve	420,000		$ 428,000
Income taxes paid	$ 0	$ 775,000
Frequency of principal payments	Quarterly by the 15th of the first month of each quarter in 58 payments
Percentage of floating interest rate payable	5.00%
Demand promissory note from third party	$ 125,000
Other non-current assets
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Note receivable	$ 125,000
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 other lease of equipment at an annual payment of less than $2,000
Threshold limit of annual payment of one lease equipment	$ 2,000