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Shareholders' Equity (Share Repurchases, Cumberland Emerging Technologies, Narrative) (Details) - USD ($)
 1 Months Ended 12 Months Ended
Apr. 30, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
May 31, 2010
Equity, Class of Treasury Stock [Line Items]            
Repurchase of common shares, value   $ 2,520,715 $ 5,338,967 $ 4,315,444    
Exercise of options and related tax benefit       $ 1,000,005    
Noncontrolling interest, ownership percentage by parent         85.00%  
Payments to acquire interest in subsidiaries $ 1,000,000          
Loans Forgiven in Exchange For Share Issued, Amount $ 2,400,000          
Shares Repurchase, All, Except Settlement of Tax Liabilities Related to Exercise of Stock Options            
Equity, Class of Treasury Stock [Line Items]            
Repurchase of common shares, shares   (529,312) (829,003) (881,810)    
Repurchase of common shares, value   $ 2,500,000 $ 5,300,000 $ 4,300,000    
Share Repurchase Program Authorized in 2010            
Equity, Class of Treasury Stock [Line Items]            
Share repurchase program, number of shares authorized to be repurchased           $ 10,000,000