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Accounting policies (Details Textual) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2007
gal
Accounting Policies [Line Items]        
Revenues $ 63,822,131 $ 65,450,702 $ 55,154,492  
Gross profit 23,505,879 21,992,442 19,022,067  
Foreign Currency Transaction Gain (Loss), before Tax (197,396) 68,355 85,996  
Impaired Assets to be Disposed of by Method Other than Sale, Amount of Impairment Loss   432,727    
Interest Costs Capitalized     246,851  
Goodwill, Impairment Loss   88,717    
Fair Value Inputs, Control Premium 0.00%      
Accumulated Amortization of Other Deferred Costs 1,300,000 1,100,000    
Equity Method Investment, Additional Information The Company uses the equity method of accounting for investments in common stock where the Company holds 20% to 50% of the voting stock of the investee and has significant influence over its operating and financial policies but does not meet the criteria for consolidation.      
Criteria For Recognizing Investment At Cost Investments where the Company does not exercise significant influence over the operating and financial policies of the investee and holds less than 20% of the voting stock are recorded at cost.      
Amount Of Water Lost (in gallons)       438,000,000
Other Assets, Noncurrent 2,792,831 2,706,185    
Cash Deposits In Excess Of Federally Insured Limits 554,000      
Cash And Restricted Cash Equivalents Held In Foreign Bank 33,100,000      
Estimated Fair Value Percentage Of Services Unit   The fair value the Company estimated for its services unit for the year ended December 31, 2012 was 10% less than its carrying amount.    
Retail [Member]
        
Accounting Policies [Line Items]        
Revenues 23,018,498 24,222,895 23,356,338  
Gross profit 11,995,402 12,674,640 11,859,740  
Estimated Fair Value Carrying Amount Exceeded Percentage 47.00% 39.00%    
Bulk [Member]
        
Accounting Policies [Line Items]        
Revenues 39,960,220 40,758,182 30,757,874  
Gross profit 11,747,324 9,078,295 6,630,386  
Estimated Fair Value Carrying Amount Exceeded Percentage 23.00% 6.00%    
Services [Member]
        
Accounting Policies [Line Items]        
Revenues 843,413 469,625 1,040,280  
Gross profit (236,847) 239,507 531,941  
Estimated Fair Value Carrying Amount Exceeded Percentage   10.00%    
Capitalized Engineering Labor and Materials Cost [Member]
        
Accounting Policies [Line Items]        
Other Assets, Noncurrent 3,500,000 3,500,000    
Cw Bermuda [Member]
        
Accounting Policies [Line Items]        
Revenues     723,000  
Gross profit     $ 457,000