Consolidated Balance Sheets - USD ($)	Dec. 31, 2020	Dec. 31, 2019
CURRENT ASSETS:
Cash and cash equivalents	$ 86,036,000	$ 79,579,000
Marketable securities	68,981,000	78,733,000
Accounts receivable	53,979,000	41,914,000
Less allowance for doubtful accounts	312,000	450,000
Accounts receivable, net	53,667,000	41,464,000
Inventories:
Finished goods	31,440,000	33,495,000
Work in process	96,463,000	87,805,000
Raw materials and supplies	7,585,000	7,236,000
Total inventory	135,488,000	128,536,000
Notes receivable, current	2,869,000	2,853,000
Other current assets	10,199,000	6,668,000
Total current assets	357,240,000	337,833,000
PROPERTY, PLANT AND EQUIPMENT:
Land and land improvements	3,008,000	3,008,000
Buildings	48,706,000	47,748,000
Machinery and equipment	44,774,000	43,226,000
PROPERTY, PLANT AND EQUIPMENT	96,488,000	93,982,000
Less allowance for depreciation and amortization	59,375,000	56,704,000
PROPERTY, PLANT AND EQUIPMENT, NET	37,113,000	37,278,000
GOODWILL	15,317,000	15,317,000
INTANGIBLE ASSETS, net	2,838,000	3,059,000
NOTES RECEIVABLE	7,399,000	7,182,000
RIGHT-OF-USE LEASE ASSETS	3,363,000	3,521,000
DEFERRED INCOME TAXES	2,994,000	1,281,000
OTHER ASSETS	6,906,000	4,782,000
Assets, Total	433,170,000	410,253,000
CURRENT LIABILITIES:
Accounts payable	33,474,000	21,652,000
Federal and state income taxes	4,777,000	3,799,000
Lease liabilities	573,000	520,000
Accrued liabilities	16,268,000	13,324,000
Total current liabilities	55,092,000	39,295,000
LEASE LIABILITIES - NON-CURRENT	2,790,000	3,001,000
OTHER NON-CURRENT LIABILITIES	940,000	0
Total liabilities	58,822,000	42,296,000
COMMITMENTS AND CONTINGENCIES
STOCKHOLDERS' EQUITY
Common stock, $1 par value: Authorized: 12,000,000 shares at December 31, 2020 and 2019 Issued: 7,440,518 shares at December 31, 2020 and 2019 Outstanding: 7,025,433 and 7,006,323 shares at December 31, 2020 and 2019, respectively	7,441,000	7,441,000
Paid-in capital	12,438,000	11,447,000
Retained earnings	367,627,000	362,842,000
Accumulated other comprehensive income	154,000	136,000
Stockholders' Equity before Treasury Stock	387,660,000	381,866,000
Less treasury stock, at cost, 415,085 and 434,195 shares at December 31, 2020 and 2019, respectively	13,312,000	13,909,000
Total stockholders' equity	374,348,000	367,957,000
Liabilities and Equity, Total	$ 433,170,000	$ 410,253,000