Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 27, 2020	Dec. 31, 2019
CURRENT ASSETS:
Cash and cash equivalents	$ 44,428	$ 79,579
Marketable securities	79,098	78,733
Accounts receivable, net	63,163	41,464
Inventories:
Finished goods	34,544	33,495
Work in process	93,716	87,805
Raw materials	7,842	7,236
Total inventory	136,102	128,536
Notes receivable, current	2,868	2,853
Other current assets	9,099	6,668
Total current assets	334,758	337,833
PROPERTY, PLANT AND EQUIPMENT	95,435	93,982
Less allowance for depreciation	58,731	56,704
PROPERTY, PLANT AND EQUIPMENT, NET	36,704	37,278
GOODWILL	15,317	15,317
INTANGIBLE ASSETS, net	2,892	3,059
NOTES RECEIVABLE	7,343	7,182
RIGHT-OF-USE LEASE ASSETS	3,373	3,521
DEFERRED INCOME TAXES	1,256	1,281
OTHER ASSETS	9,035	4,782
Assets, Total	410,678	410,253
CURRENT LIABILITIES:
Accounts payable	28,891	21,652
Federal and state income taxes	2,252	3,799
Lease liabilities	547	520
Accrued liabilities	14,949	13,324
Total current liabilities	46,639	39,295
LEASE LIABILITIES - NON-CURRENT	2,826	3,001
OTHER NON-CURRENT LIABILITIES	1,166	0
Total liabilities	50,631	42,296
COMMITMENTS AND CONTINGENCIES
STOCKHOLDERS' EQUITY
Common stock, $1 par value: Authorized: 12,000,000 shares Issued: 7,440,518 shares	7,441	7,441
Paid-in capital	12,131	11,447
Retained earnings	353,687	362,842
Accumulated other comprehensive income	230	136
Stockholders' Equity before Treasury Stock	373,489	381,866
Treasury stock, at cost	13,442	13,909
Total stockholders' equity	360,047	367,957
Liabilities and Equity, Total	$ 410,678	$ 410,253