Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Apr. 04, 2021	Dec. 31, 2020
CURRENT ASSETS:
Cash and cash equivalents	$ 65,121	$ 86,036
Marketable securities	52,092	68,981
Accounts receivable, net	48,117	53,667
Inventories:
Finished goods	35,858	31,440
Work in process	96,912	96,463
Raw materials	8,340	7,585
Total inventory	141,110	135,488
Notes receivable, current	2,870	2,869
Other current assets	10,290	10,199
Total current assets	319,600	357,240
PROPERTY, PLANT AND EQUIPMENT	97,613	96,488
Less allowance for depreciation	60,054	59,375
PROPERTY, PLANT AND EQUIPMENT, NET	37,559	37,113
GOODWILL	15,317	15,317
INTANGIBLE ASSETS, net	2,785	2,838
NOTES RECEIVABLE	7,455	7,399
RIGHT-OF-USE LEASE ASSETS	3,223	3,363
DEFERRED INCOME TAXES	3,007	2,994
OTHER ASSETS	6,285	6,906
Assets, Total	395,231	433,170
CURRENT LIABILITIES:
Accounts payable	27,682	33,474
Federal and state income taxes	7,435	4,777
Lease liabilities	581	573
Accrued liabilities	15,832	16,268
Total current liabilities	51,530	55,092
LEASE LIABILITIES - NON-CURRENT	2,642	2,790
OTHER NON-CURRENT LIABILITIES	940	940
Total liabilities	55,112	58,822
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	13,006	12,438
Retained earnings	332,538	367,627
Accumulated other comprehensive income	105	154
Stockholders' Equity before Treasury Stock	353,090	387,660
Treasury stock, at cost	12,971	13,312
Total stockholders' equity	340,119	374,348
Liabilities and Equity, Total	$ 395,231	$ 433,170