CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
CONSOLIDATED STATEMENTS OF INCOME
Revenues	$ 165,009	$ 147,591	$ 155,066
Cost of Goods Sold	95,637	81,428	84,378
Gross Profit	69,372	66,163	70,688
Operating Expenses:
Selling	8,061	7,520	8,813
General and administrative	19,597	17,330	16,308
Research and development	5,672	5,645	5,038
Total operating expense	33,330	30,495	30,159
Operating Income	36,042	35,668	40,529
Interest and Dividend Income	843	1,444	2,487
Other Investment Income (Loss)	1,477	1,355	152
Other Income	67
Income before Provision for Income Taxes	38,429	38,467	43,168
Provision for Income Taxes	(5,374)	(6,352)	(6,407)
Net Income	$ 33,055	$ 32,115	$ 36,761
Net Income Per Basic Share	$ 18.22	$ 17.49	$ 19.82
Weighted Average Basic Shares Outstanding	1,814	1,836	1,855
Net Income Per Diluted Share	$ 18.18	$ 17.44	$ 19.73
Weighted Average Diluted Shares Outstanding	1,818	1,841	1,863
Dividends Per Common Share	$ 7.40	$ 6.60	$ 5.80