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FINANCING ARRANGEMENTS (Details) (USD $)
1 Months Ended
Mar. 31, 2013
Dec. 31, 2012
May 02, 2012
Financing arrangements      
Outstanding balance $ 6,999,979 $ 7,923,487  
Long-term debt - net of current maturities 4,316,423 2,865,899  
Current maturities of long-term debt (564,705) (453,105)  
Line of credit
     
Financing arrangements      
Maximum borrowing capacity     13,500,000
Variable rate basis three-month LIBOR    
Interest rate margin on variable rate basis (as a percent) 2.75%    
Interest rate (as a percent) 3.00%    
Weighted-average interest rate (as a percent) 3.13%    
Outstanding balance 6,999,979 7,923,487  
Unused availability supported by entity's borrowing base 4,800,000    
Real estate term note
     
Financing arrangements      
Variable rate basis three-month LIBOR    
Interest rate margin on variable rate basis (as a percent) 3.25%    
Interest rate (as a percent) 3.50%    
Weighted-average interest rate (as a percent) 3.42%    
Real estate term note maturing on March 31, 2027
     
Financing arrangements      
Debt instrument, face amount     1,800,000
Real estate term note expiring on May 31, 2012
     
Financing arrangements      
Debt instrument, face amount     900,000
Term loan
     
Financing arrangements      
Long-term debt - net of current maturities 900,000    
Term loan | Maximum
     
Financing arrangements      
Debt instrument, face amount     2,000,000
Equipment term loan tied to equipment purchased in Mankato acquisition
     
Financing arrangements      
Debt instrument, additional borrowing amount   $ 1,700,000