Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues	$ 131,993	$ 119,062	$ 117,704
Cost of Goods Sold	68,931	62,922	57,697
Gross Profit	63,062	56,140	60,007
Operating Expenses:
Selling	6,218	5,694	5,325
General and administrative	14,612	13,054	13,646
Research and development	4,288	3,766	2,868
Operating Expenses, Total	25,118	22,514	21,839
Operating Income	37,944	33,626	38,168
Interest Income	1,313	1,447	1,295
Other Income, net	8	2	12
Income before Provision for Income Taxes	39,265	35,075	39,475
Provision for Income Taxes	(12,683)	(11,446)	(13,437)
Net Income	$ 26,582	$ 23,629	$ 26,038
Net Income Per Basic Share	$ 13.22	$ 11.72	$ 12.90
Weighted Average Basic Shares Outstanding	2,010	2,016	2,019
Net Income Per Diluted Share	$ 13.18	$ 11.66	$ 12.82
Weighted Average Diluted Shares Outstanding	2,017	2,027	2,031
Dividends Per Common Share	$ 2.40	$ 12.10	$ 1.82