Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 28, 2020	Dec. 31, 2019
CURRENT ASSETS:
Cash and cash equivalents	$ 32,359	$ 79,579
Marketable securities	98,382	78,733
Accounts receivable, net	52,379	41,464
Inventories:
Finished goods	23,968	33,495
Work in process	100,889	87,805
Raw materials	7,487	7,236
Total inventory	132,344	128,536
Notes receivable, current	2,867	2,853
Other current assets	11,183	6,668
Total current assets	329,514	337,833
PROPERTY, PLANT AND EQUIPMENT	94,691	93,982
Less allowance for depreciation	58,066	56,704
PROPERTY, PLANT AND EQUIPMENT, NET	36,625	37,278
GOODWILL	15,317	15,317
INTANGIBLE ASSETS, net	2,945	3,059
NOTES RECEIVABLE	7,289	7,182
RIGHT-OF-USE LEASE ASSETS	3,466	3,521
DEFERRED INCOME TAXES	1,015	1,281
OTHER ASSETS	10,149	4,782
Assets, Total	406,320	410,253
CURRENT LIABILITIES:
Accounts payable	32,356	21,652
Federal and state income taxes	8,890	3,799
Lease liabilities	542	520
Accrued liabilities	13,378	13,324
Total current liabilities	55,166	39,295
LEASE LIABILITIES - NON-CURRENT	2,924	3,001
OTHER NON-CURRENT LIABILITIES	535	0
Total liabilities	58,625	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	11,923	11,447
Retained earnings	341,549	362,842
Accumulated other comprehensive income	294	136
Stockholders' Equity before Treasury Stock	361,207	381,866
Treasury stock, at cost	13,512	13,909
Total stockholders' equity	347,695	367,957
Liabilities and Equity, Total	$ 406,320	$ 410,253