CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Revenues:        
Equipment leasing $ 2,188,954 $ 2,436,362 $ 4,530,247 $ 4,876,376
Administrative, field & support service revenues 117,107 127,130 236,929 241,777
Equipment sales 111,502 46,105 150,802 54,290
Royalty revenue   157,532   282,815
Total revenues 2,417,563 2,767,129 4,917,978 5,455,258
Operating expenses:        
Cost of revenues 762,778 803,030 1,598,821 1,757,083
Research and development 227,606 295,083 459,495 609,319
Sales, general and administrative 1,690,255 1,515,225 3,228,533 3,057,053
Total operating expenses 2,680,639 2,613,338 5,286,849 5,423,455
Operating income (loss) (263,076) 153,791 (368,871) 31,803
Interest income (expense):        
Interest income 1 1 2 5
Interest expense (386,435) (328,015) (745,927) (652,387)
Total interest income (expense) (386,434) (328,014) (745,925) (652,382)
Loss before provision for income taxes (649,510) (174,223) (1,114,796) (620,579)
Provision for income taxes        
Net loss (649,510) (174,223) (1,114,796) (620,579)
Preferred stock dividends and accretion (372,595) (347,723) (741,400) (691,923)
Net loss available to common stockholders $ (1,022,105) $ (521,946) $ (1,856,196) $ (1,312,502)
Basic and diluted loss per common share (in dollars per share) $ (0.09) $ (0.05) $ (0.17) $ (0.12)
Weighted average shares of common stock outstanding (in shares) 10,930,117 10,844,906 10,929,451 10,830,919