Consolidated Statements of Comprehensive Income - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net sales	$ 252,596,000	$ 210,317,000	$ 196,249,000
Costs and expenses:
Cost of goods sold	165,614,000	138,884,000	127,512,000
Selling and administrative expenses	66,396,000	52,018,000	50,724,000
Interest expense	688,000	519,000	484,000
	232,698,000	191,421,000	178,720,000
Income before taxes on income	19,898,000	18,896,000	17,529,000
Income tax expense	5,260,000	5,830,000	6,180,000
Net income	$ 14,638,000	$ 13,066,000	$ 11,349,000
Weighted average number of shares outstanding during the period
(Basic) (in shares)	14,082,243	13,761,009	13,298,452
(Diluted) (in shares)	14,897,489	14,578,644	13,864,698
Basic
Net earnings (in dollars per share)	$ 1.04	$ 0.95	$ 0.85
Diluted
Net earnings (in dollars per share)	$ 0.98	$ 0.90	$ 0.82
Other comprehensive income (loss), net of tax:
Recognition of net losses included in net periodic pension costs	$ 667,000	$ 499,000	$ 211,000
Recognition of settlement loss included in net periodic pension costs	287,000	297,000	134,000
Current period loss	(764,000)	(1,410,000)	(3,050,000)
Gain (loss) on cash flow hedging activities	95,000	37,000	(26,000)
Foreign Currency Translation Adjustment:
Reclassification of gain on foreign currency transactions included in net income	(170,000)
Foreign currency translation adjustments	243,000
Other comprehensive income (loss)	358,000	(577,000)	(2,731,000)
Comprehensive income	$ 14,996,000	$ 12,489,000	$ 8,618,000
Cash dividends per common share (in dollars per share)	$ 0.34	$ 0.315	$ 0.285