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CONDENSED STATEMENTS OF CASH FLOWS - USD ($)
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash flows from operating activities    
Net loss $ (939,091) $ (944,345)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Provision for doubtful accounts 22,000 100,000
Depreciation and amortization 204,266 225,834
(Increase) decrease in assets:    
Inventories (46,367) (977,205)
Accounts receivable 1,715,858 2,120,322
Other current assets 496,407 305,608
Other assets (750)  
Increase (decrease) in liabilities:    
Accounts payable (1,328,233) (188,786)
Other accrued liabilities 92,233 (85,261)
Income taxes payable 1,756 62
Net cash provided by operating activities 218,079 556,229
Cash flows from investing activities    
Purchase of property, plant, and equipment (75,650) (363,177)
Changes in restricted cash   (295)
Net cash used by investing activities (75,650) (363,472)
Cash flows from financing activities    
Repayments of long-term debt and notes payable (65,626) (37,064)
Proceeds from the exercise of stock options 29,200 60,583
Payment of Preferred Stock dividends (55,414)  
Net cash provided (used) by financing activities (91,840) 23,519
Net increase in cash and cash equivalents. 50,589 216,276
Cash and cash equivalents at:    
Beginning of period 18,045,044 22,128,977
End of period 18,095,633 22,345,253
Supplemental schedule of cash flow information:    
Interest paid 49,623 53,810
Income taxes paid   1,981
Supplemental schedule of noncash investing and financing activities:    
Preferred dividends declared, not paid $ 55,113 $ 170,817