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Income Taxes (Details Textual) (USD $)
 12 Months Ended
May 31, 2014
May 31, 2013
May 31, 2012
May 31, 2011
Income Taxes (Textual) [Abstract]        
Remaining federal net operating loss $ 26,100,000      
State net operating loss expire prior to utilization 13,000,000      
Taxable income per year for the next ten years 10,000,000      
Taxable income per year for the final eight years 6,500,000      
Federal net operating loss carryforwards after considering IRC Section 382 limitations 138,800,000      
Federal net operating loss first amount expiring 30,700,000      
Maturity period of federal net operating loss carryforwards first amount minimum 2017      
Maturity period of federal net operating loss carryforwards first amount maximum 2026      
Federal net operating loss second amount expiring 108,000,000      
Maturity period of federal net operating loss carryforwards second amount minimum 2027      
Maturity period of federal net operating loss carryforwards second amount maximum 2033      
State net operating loss carryforwards after considering remaining IRC Section 382 limitations 19,800,000      
Maturity period of state net operating loss carryforwards minimum 2015      
Maturity period of state net operating loss carryforwards maximum 2033      
Net deferred income tax asset 13,200,000      
Valuation Allowance (1,532,000) (712,000)    
Increase decrease valuation allowance 800,000 500,000    
Effective income tax rate 35.00%      
Tax liability not recognized 0      
Unrecognized tax benefits 0      
Accrued interest and penalties recognized 0 0    
Correct state tax credit benefit       300,000
State tax credit claim     200,000  
Beginning of open tax year range 2011      
End of open tax year range 2014      
Foreign subsidiary undistributed earnings 4,000,000      
State [Member]
        
Income Tax [Line Items]        
Federal and State net operating loss carryforwards 32,700,000      
Federal [Member]
        
Income Tax [Line Items]        
Federal and State net operating loss carryforwards 164,900,000      
Operating loss carryforwards from acquired companies $ 161,500,000