BALANCE SHEETS - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 9,647,292	$ 14,877,899
Accounts receivable, net of allowance for doubtful accounts of $149,665 and $101,872, respectively	4,912,356	5,105,556
Held-to-maturity securities, at amortized cost	996,233
Inventories, net	7,545,094	6,206,161
Income taxes receivable	100,887
Other current assets	644,803	418,154
Total current assets	23,846,665	26,607,770
Property, plant, and equipment, net	10,851,747	11,353,202
Held-to-maturity securities, at amortized cost (non-current)	1,989,923
Income taxes receivable	100,835	188,456
Other assets	2,849	6,052
Total assets	36,792,019	38,155,480
Current liabilities:
Accounts payable	5,369,677	4,957,750
Current portion of long-term debt	406,361	410,949
Accrued compensation	540,852	547,021
Dividends payable	55,113	55,113
Accrued royalties to shareholder	769,324	793,489
Insurance proceeds		466,293
Other accrued liabilities	1,387,287	657,923
Income taxes payable	10,025	11,407
Total current liabilities	8,538,639	7,899,945
Long-term debt, net of current maturities	2,639,647	3,081,409
Total liabilities	11,178,286	10,981,354
Commitments and contingencies - See Note 9
Preferred stock, $1 par value:
Common Stock, no par value; authorized: 100,000,000 shares; outstanding: 32,666,454
Additional paid-in capital	61,871,756	62,092,206
Accumulated deficit	(37,039,468)	(35,699,525)
Total stockholders' equity	25,613,733	27,174,126
Total liabilities and stockholders' equity	36,792,019	38,155,480
Series I, Class B
Preferred stock, $1 par value:
Preferred stock	98,500	98,500
Series II, Class B
Preferred stock, $1 par value:
Preferred stock	171,200	171,200
Series III, Class B
Preferred stock, $1 par value:
Preferred stock	129,245	129,245
Series IV, Class B
Preferred stock, $1 par value:
Preferred stock	342,500	342,500
Series V, Class B
Preferred stock, $1 par value:
Preferred stock	$ 40,000	$ 40,000