Consolidated Balance Sheets - USD ($)	Dec. 31, 2018	Dec. 31, 2017
CURRENT ASSETS:
Cash and cash equivalents	$ 56,847,000	$ 11,222,000
Marketable securities	134,598,000	144,252,000
Accounts receivable	53,119,000	67,089,000
Less allowance for doubtful accounts	747,000	1,869,000
Accounts receivable, net	52,372,000	65,220,000
Inventories:
Finished goods	28,791,000	27,242,000
Work in process	59,580,000	72,219,000
Raw materials and supplies	5,617,000	4,978,000
Total inventory	93,988,000	104,439,000
Assets held for sale	375,000	6,189,000
Notes receivable, current	7,213,000
Other current assets	6,869,000	7,186,000
Total current assets	352,262,000	338,508,000
PROPERTY, PLANT AND EQUIPMENT:
Land and land improvements	3,008,000	4,985,000
Buildings	45,995,000	47,412,000
Machinery and equipment	47,091,000	51,141,000
PROPERTY, PLANT AND EQUIPMENT	96,094,000	103,538,000
Less allowance for depreciation	56,951,000	58,370,000
PROPERTY, PLANT AND EQUIPMENT, NET	39,143,000	45,168,000
GOODWILL	11,485,000	11,485,000
INTANGIBLE ASSETS, net	1,000,000	3,330,000
NOTES RECEIVABLE	6,966,000	6,750,000
DEFERRED INCOME TAXES	1,088,000	995,000
OTHER ASSETS	1,674,000	5,637,000
Total assets	413,618,000	411,873,000
CURRENT LIABILITIES:
Accounts payable	34,100,000	28,445,000
Federal and state income taxes	1,384,000	3,750,000
Accrued liabilities	12,011,000	13,092,000
Liabilities held for sale		210,000
Total current liabilities	47,495,000	45,497,000
COMMITMENTS AND CONTINGENCIES
STOCKHOLDERS' EQUITY
Common stock, $1 par value: Authorized: 12,000,000 shares at December 31, 2018 and 2017; Issued: 7,440,518 shares at December 31, 2018 and 2017; Outstanding: 6,981,080 and 6.968,120 shares at December 31, 2018 and 2017, respectivley	7,441,000	7,441,000
Paid-in capital	10,360,000	9,074,000
Retained earnings	362,709,000	364,757,000
Accumulated other comprehensive income (loss)	21,000	(86,000)
Stockholders' equity before treasury stock	380,531,000	381,186,000
Less treasury stock, at cost, 459,438 and 472,398 shares at December 31, 2018 and 2017, respectively	14,408,000	14,810,000
Total stockholders' equity	366,123,000	366,376,000
Total liabilities and stockholders' equity	$ 413,618,000	$ 411,873,000