Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
CURRENT ASSETS:
Cash and cash equivalents	$ 63,546	$ 87,657
Marketable securities	24,372	26,454
Accounts receivable, net	38,099	48,727
Inventories:
Finished goods	26,426	31,815
Work in process	162,345	144,684
Raw materials	15,215	13,921
Inventory, net	203,986	190,420
Notes receivable, current	1,470	1,629
Other current assets	6,821	5,223
Total current assets	338,294	360,110
PROPERTY, PLANT AND EQUIPMENT	107,390	107,010
Less allowance for depreciation	68,867	67,774
Property, plant and equipment, net	38,523	39,236
GOODWILL	19,433	19,433
INTANGIBLE ASSETS, net	4,912	5,290
RIGHT-OF-USE LEASE ASSETS	10,490	10,664
DEFERRED INCOME TAXES	5,803	5,803
Assets	417,455	440,536
CURRENT LIABILITIES:
Accounts payable	32,624	38,232
Federal and state income taxes	4,323	2,539
Lease liabilities	675	678
Accrued liabilities	36,105	30,570
Total current liabilities	73,727	72,019
LEASE LIABILITIES - NON-CURRENT	9,815	9,986
FEDERAL AND STATE INCOME TAXES - NON-CURRENT	2,275	2,275
Total liabilities	85,817	84,280
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	16,496	16,031
Retained earnings	318,766	344,245
Accumulated other comprehensive income	21	22
Stockholders' Equity before Treasury Stock	342,724	367,739
Treasury stock, at cost	11,086	11,483
Total stockholders' equity	331,638	356,256
Liabilities and Equity	$ 417,455	$ 440,536