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Business Description and Summary of Significant Accounting Policies (Detail Textuals) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Accounting Policies [Abstract]    
Allowance for doubtful accounts $ 170,000 $ 149,000
Warranty reserve 428,000 39,000
Inventory reserve 1,543,000 1,438,000
Income taxes paid 1,325,000 73,000
Interest paid $ 107,000 $ 77,000