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Consolidated Statements of Operations (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Sales:      
Product $ 90,677,292 $ 85,135,618 $ 92,058,745
Service 46,434,918 27,400,246 20,184,049
Net sales 137,112,210 112,535,864 112,242,794
Costs and expenses:      
Costs of product sales 51,774,588 46,598,595 51,347,555
Costs of service sales 30,362,866 20,969,805 16,086,394
Research and development 12,147,998 11,548,247 10,714,889
Sales, marketing and support 24,069,079 23,472,521 18,470,019
General and administrative 12,187,794 10,555,026 10,083,851
Total costs and expenses 130,542,325 113,144,194 106,702,708
Income (loss) from operations 6,569,885 (608,330) 5,540,086
Interest income 510,471 296,953 301,352
Interest expense 323,431 223,061 204,076
Other income 86,247 909,619 23,448
Income before income tax (expense) benefit 6,843,172 375,181 5,660,810
Income tax (expense) benefit (3,262,557) 484,468 2,612,402
Net income $ 3,580,615 $ 859,649 $ 8,273,212
Per share information:      
Net income per share, basic (in dollars per share) $ 0.24 $ 0.06 $ 0.57
Net income per share, diluted (in dollars per share) $ 0.24 $ 0.06 $ 0.56
Number of shares used in per share calculation:      
Basic (in shares) 14,777,175 14,767,606 14,419,599
Diluted (in shares) 15,018,951 15,072,342 14,850,325