Consolidated Balance Sheets - USD ($)	Dec. 31, 2019	Dec. 31, 2018
CURRENT ASSETS:
Cash and cash equivalents	$ 79,579,000	$ 56,847,000
Marketable securities	78,733,000	134,598,000
Accounts receivable	41,914,000	53,119,000
Less allowance for doubtful accounts	450,000	747,000
Accounts receivable, net	41,464,000	52,372,000
Inventories:
Finished goods	33,495,000	28,791,000
Work in process	87,805,000	59,580,000
Raw materials and supplies	7,236,000	5,617,000
Total inventory	128,536,000	93,988,000
Assets held for sale		375,000
Notes receivable, current	2,853,000	7,213,000
Other current assets	6,668,000	6,869,000
Total current assets	337,833,000	352,262,000
PROPERTY, PLANT AND EQUIPMENT:
Land and land improvements	3,008,000	3,008,000
Buildings	47,748,000	45,995,000
Machinery and equipment	43,226,000	47,091,000
PROPERTY, PLANT AND EQUIPMENT	93,982,000	96,094,000
Less allowance for depreciation and amortization	56,704,000	56,951,000
PROPERTY, PLANT AND EQUIPMENT, NET	37,278,000	39,143,000
GOODWILL	15,317,000	11,485,000
INTANGIBLE ASSETS, net	3,059,000	1,000,000
NOTES RECEIVABLE	7,182,000	6,966,000
RIGHT-OF-USE LEASE ASSETS	3,521,000
DEFERRED INCOME TAXES	1,281,000	1,088,000
OTHER ASSETS	4,782,000	1,674,000
Total assets	410,253,000	413,618,000
CURRENT LIABILITIES:
Accounts payable	21,652,000	34,100,000
Federal and state income taxes	3,799,000	1,384,000
Lease liabilities	520,000
Accrued liabilities	13,324,000	12,011,000
Total current liabilities	39,295,000	47,495,000
LEASE LIABILITIES - NON-CURRENT	3,001,000
Total liabilities	42,296,000	47,495,000
STOCKHOLDERS' EQUITY
Common stock, $1 par value: Authorized: 12,000,000 shares at December 31, 2019 and 2018; Issued: 7,440,518 shares at December 31, 2019 and 2018; Outstanding: 7,006,323 and 6,981,080 shares at December 31, 2019 and 2018, respectively	7,441,000	7,441,000
Paid-in capital	11,447,000	10,360,000
Retained earnings	362,842,000	362,709,000
Accumulated other comprehensive income	136,000	21,000
Stockholders' equity before treasury stock	381,866,000	380,531,000
Less treasury stock, at cost, 434,195 and 459,438 shares at December 31, 2019 and 2018, respectively	13,909,000	14,408,000
Total stockholders' equity	367,957,000	366,123,000
Total liabilities and stockholders' equity	$ 410,253,000	$ 413,618,000