CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Jul. 02, 2022	Dec. 31, 2021
Current Assets
Cash	$ 43,539	$ 21,044
Short-term investments	165,000	199,971
Trade receivables, net	56,243	57,036
Gross inventories (Note 4)	114,863	100,023
Less LIFO reserve	(53,532)	(51,826)
Less excess and obsolescence reserve	(4,186)	(4,347)
Net inventories	57,145	43,850
Prepaid expenses and other current assets	12,150	6,832
Total Current Assets	334,077	328,733
Property, plant and equipment	434,790	421,282
Less allowances for depreciation	(359,566)	(347,651)
Net property, plant and equipment	75,224	73,631
Deferred income taxes	291	536
Other assets	34,140	39,443
Total Assets	443,732	442,343
Current Liabilities
Trade accounts payable and accrued expenses	27,306	36,400
Contract liabilities with customers (Note 3)
Product liability	441	795
Employee compensation and benefits	20,643	33,154
Workers' compensation	6,105	6,760
Total Current Liabilities	54,495	77,109
Product liability accrual	118	97
Lease liability (Note 5)	2,162	1,476
Contingent liabilities (Note 13)
Stockholders' Equity
Additional paid-in capital	46,760	46,847
Retained earnings	461,409	438,098
Less: Treasury stock - at cost 2022 - 6,709,898 shares 2021 - 6,709,898 shares	(145,590)	(145,590)
Total Stockholders' Equity	386,957	363,661
Total Liabilities and Stockholders' Equity	443,732	442,343
Nonvoting Common Stock [Member]
Stockholders' Equity
Common stock
Common Stock [Member]
Stockholders' Equity
Common stock	$ 24,378	$ 24,306