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Business Description and Summary of Significant Accounting Policies (Detail Textuals) - USD ($)
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Accounting Policies [Abstract]      
Allowance for doubtful accounts $ 149,000   $ 149,000
Inventory reserve 1,492,000   $ 1,438,000
Income taxes paid 775,000 $ 165,000  
Interest paid 52,000 $ 38,000  
Accumulated other comprehensive loss to retained earnings due to change in corporate tax rate $ 6,000