CONDENSED BALANCE SHEETS - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 12,849,614	$ 14,877,899
Accounts receivable, net	4,806,226	5,105,556
Inventories, net	7,787,340	6,206,161
Other current assets	415,338	418,154
Total current assets	25,858,518	26,607,770
Property, plant, and equipment, net	11,045,766	11,353,202
Income taxes receivable	188,456	188,456
Other assets	4,280	6,052
Total assets	37,097,020	38,155,480
Current liabilities:
Accounts payable	4,802,532	4,957,750
Current portion of long-term debt	364,094	410,949
Accrued compensation	567,768	547,021
Dividends payable	55,113	55,113
Accrued royalties to shareholder	1,061,483	793,489
Insurance proceeds	315,387	466,293
Other accrued liabilities	1,093,526	657,923
Income taxes payable	11,617	11,407
Total current liabilities	8,271,520	7,899,945
Long-term debt, net of current maturities	2,888,589	3,081,409
Total liabilities	11,160,109	10,981,354
Commitments and contingencies - See Note 6
Preferred stock, $1 par value:
Additional paid-in capital	61,981,981	62,092,206
Accumulated deficit	(36,826,515)	(35,699,525)
Total stockholders' equity	25,936,911	27,174,126
Total liabilities and stockholders' equity	37,097,020	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