401(k) Plan	12 Months Ended
Dec. 31, 2017
401(k) Plan [Abstract]
401(k) Plan	G. 401(K) PLAN: The Company sponsors a 401(k) retirement plan that covers substantially all non-union employees. Historically, the Company matched up to 50% of the first 4% of salary contributed by employees to the plan. This matching contribution was made with common stock. Starting in 2004, the Company began to match, in cash, an additional 50% of the first 4% of salary contributed by employees plus 3% of total compensation for certain employees. Contributions made from treasury stock, including the Company's related cash dividends, totaled $1,194,000 in 2017, $1,225,000 in 2016, and $1,098,000 in 2015. In addition, the Company made cash contributions of $817,000 in 2017, $924,000 in 2016, and $941,000 in 2015 to the 401(k) Plan. The Company also contributed $369,000, $358,000, and $393,000 to the 401(k) retirement plan covering its union employees at the Amron Division of the AMTEC subsidiary during the years ended December 31, 2017, 2016, and 2015, respectively.

G. 401(K) PLAN:

The Company sponsors a 401(k) retirement plan that covers substantially all non-union employees. Historically, the Company matched up to 50% of the first 4% of salary contributed by employees to the plan. This matching contribution was made with common stock. Starting in 2004, the Company began to match, in cash, an additional 50% of the first 4% of salary contributed by employees plus 3% of total compensation for certain employees. Contributions made from treasury stock, including the Company's related cash dividends, totaled $1,194,000 in 2017, $1,225,000 in 2016, and $1,098,000 in 2015. In addition, the Company made cash contributions of $817,000 in 2017, $924,000 in 2016, and $941,000 in 2015 to the 401(k) Plan. The Company also contributed $369,000, $358,000, and $393,000 to the 401(k) retirement plan covering its union employees at the Amron Division of the AMTEC subsidiary during the years ended December 31, 2017, 2016, and 2015, respectively.