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Income Taxes (Details Textual) (USD $)
 3 Months Ended 12 Months Ended
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Taxes (Additional Textual) [Abstract]          
Current net deferred tax assets   $ 100,000 $ 0    
Long-term net deferred tax assets   1,400,000 100,000    
Current net deferred tax liabilities   400,000 400,000    
Long-term net deferred tax liabilities   361,000 8,646,000    
Valuation allowance   2,100,000 3,100,000    
Operating loss carryforwards, expiration date   2019 through 2028      
Operating loss carryforwards relate to a prior acquisition   5,700,000      
Deferred income tax benefit 5,500,000        
U.S. federal and state capital loss carryforwards   1,900,000      
U.S. federal and state capital loss carry forwards expires in 2014   1,100,000      
U.S. federal and state capital loss carry forwards expires in 2016   800,000      
Net tax benefits (deficiencies) from tax deductions in excess of (or less than) book deductions resulting from employee stock option exercises   (300,000) 500,000 1,800,000  
Undistributed earnings of company's foreign subsidiaries   5,200,000      
Unrecognized tax benefits   1,671,000 1,269,000 1,222,000 919,000
Accrued interest and penalties related to uncertain tax positions   100,000 200,000    
Domestic tax authority [Member]
          
Income Taxes (Textual) [Abstract]          
Operating loss carryforwards   10,000,000      
Foreign tax authority [Member]
          
Income Taxes (Textual) [Abstract]          
Operating loss carryforwards   $ 19,800,000