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Business Description and Summary of Significant Accounting Policies (Detail Textuals) - USD ($)
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Accounting Policies [Abstract]      
Allowance for doubtful accounts $ 198,000   $ 149,000
Inventory reserve 1,492,000   1,438,000
Income taxes paid 875,000 $ 165,000  
Interest paid 80,000 $ 56,000  
Accumulated other comprehensive loss to retained earnings due to change in corporate tax rate 6,000    
Warranty reserve $ 408,000   $ 39,000