Annual report pursuant to Section 13 and 15(d)

Summary Of Significant Accounting Policies (Narrative) (Details)

v3.7.0.1
Summary Of Significant Accounting Policies (Narrative) (Details)
 12 Months Ended
Dec. 31, 2016
USD ($)
segment
$ / shares
shares
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2013
USD ($)
Summary Of Significant Accounting Policies [Line Items]        
Number of segments | segment 4      
Cash and cash equivalents $ 10,443,274 $ 9,812,737 $ 13,736,857 $ 20,059,120
Money market funds $ 3,851,000      
Value of the investment in short-term money market funds sought to be preserved (in dollars per share) | $ / shares $ 1.00      
Depreciation $ 3,609,000 3,212,000 2,375,000  
Product warranty period 5 years      
Foreign currency translation loss $ 4,238,497      
Research and development costs $ 5,366,000 $ 8,291,000 $ 7,835,000  
Dilutive shares | shares     18,384  
Shares not included in the computation of diluted earnings per share | shares     243,427  
Employee Stock Option [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Shares not included in the computation of diluted earnings per share | shares 902,930 691,924    
Deferred Stock Awards [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Shares not included in the computation of diluted earnings per share | shares 133,982 95,668