CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited)
Revenues	$ 47,334	$ 39,993
Cost of goods sold	34,983	24,912
Gross profit	12,351	15,081
Operating expenses:
Selling	2,772	2,727
General and administrative	4,787	6,254
Research and development	1,650	1,630
Operating expenses	9,209	10,611
Operating income	3,142	4,470
Interest and dividend income	156	240
Other investment income/(losses)	(109)	(721)
Other income	14	10
Total other income expense	61	(471)
Income before provision for income taxes	3,203	3,999
Provision for income taxes	(411)	(514)
Net income	$ 2,792	$ 3,485
Net income per basic share	$ 1.59	$ 1.98
Weighted average basic shares outstanding	1,760	1,762
Net income per diluted share	$ 1.59	$ 1.98
Weighted average diluted shares outstanding	1,761	1,763
Dividends per common share	$ 2.20	$ 2.15