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CONDENSED STATEMENTS OF CASH FLOWS - USD ($)
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Cash flows from operating activities    
Net loss $ (1,189,945) $ (939,091)
Adjustments to reconcile net loss to net cash provided (used) by operating activities:    
Provision for doubtful accounts   22,000
Share based compensation 234,898  
Depreciation and amortization 206,992 204,266
(Increase) decrease in assets:    
Inventories (270,863) (46,367)
Accounts receivable 81,198 1,715,858
Other current assets (251,220) 496,407
Other assets   (750)
Increase (decrease) in liabilities:    
Accounts payable (10,507) (1,328,233)
Other accrued liabilities 222,279 92,233
Income taxes payable 258 1,756
Net cash provided (used) by operating activities (976,910) 218,079
Cash flows from investing activities    
Purchase of property, plant, and equipment (17,131) (75,650)
Net cash used by investing activities (17,131) (75,650)
Cash flows from financing activities    
Repayments of long-term debt and notes payable (113,696) (65,626)
Proceeds from the sale of common stock 1,780,000  
Proceeds from the exercise of stock options   29,200
Payment of Preferred Stock dividends (55,113) (55,414)
Net cash provided (used) by financing activities 1,611,191 (91,840)
Net increase in cash and cash equivalents 617,150 50,589
Cash and cash equivalents at:    
Beginning of period 16,199,043 18,045,044
End of period 16,816,193 18,095,633
Supplemental schedule of cash flow information:    
Interest paid 48,064 49,623
Supplemental schedule of noncash investing and financing activities:    
Preferred dividends declared, not paid $ 55,113 $ 55,113