CONDENSED BALANCE SHEETS - USD ($)	Dec. 31, 2015	Dec. 31, 2014
CURRENT ASSETS:
Cash and cash equivalents (Note 7)	$ 2,248,466	$ 1,936,214
Short-term investments	0	1,766,000
Trade receivables, less allowance of $122,000 in 2015 and $49,000 in 2014 (Notes 5 and 7)	2,165,194	2,096,328
Inventories	2,119,805	2,630,650
Prepaid expenses and other assets	85,648	86,400
Income taxes receivable	102,778	163,651
Deferred income taxes (Note 2)	195,000	178,000
Total current assets	6,916,891	8,857,243
PROPERTY, PLANT, AND EQUIPMENT, at cost:
Land and building	6,391,555	6,247,781
Machinery and equipment	4,275,910	3,956,561
Office equipment	933,596	754,220
Vehicles	272,141	247,356
Construction in progress	2,491,432
Gross property, plant, and equipment, at cost	14,364,634	11,205,918
Less accumulated depreciation	(6,407,304)	(5,789,070)
Net property, plant, and equipment, at cost	7,957,330	5,416,848
INTANGIBLE ASSETS, less accumulated amortization of $123,957 in 2015 and $198,918 in 2014 (Note 3)	336,096	353,871
Total assets	15,210,317	14,627,962
CURRENT LIABILITIES:
Accounts payable - Trade	420,245	371,181
Accounts payable - Construction	333,339
Accrued compensation	350,518	294,706
Other accrued liabilities	31,000	78,610
Total current liabilities	1,135,102	744,497
DEFERRED INCOME TAXES (Note 2)	580,000	545,000
Total liabilities	$ 1,715,102	$ 1,289,497
COMMITMENTS AND CONTINGENCIES (Note 8)
STOCKHOLDERS' EQUITY:
Common stock, par value $.10 per share; authorized 4,750,000 shares: issued and outstanding 2,018,253 shares in 2015 and 2014	$ 201,825	$ 201,825
Additional paid-in capital	2,703,050	2,681,307
Retained earnings	10,590,340	10,455,333
Total stockholders' equity	13,495,215	13,338,465
Total liabilities and stockholders' equity	$ 15,210,317	$ 14,627,962