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DEBT (Details) (USD $)
12 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Promissory Notes [Abstract]    
Promissory Notes $ 1,377,000 $ 462,000
Long-Term Debt and Capital Lease Obligations [Abstract]    
Long-Term Debt and Capital Lease Obligations 14,706,000 12,435,000
Less: Current maturities 4,551,000 3,757,000
Long-Term Debt and Capital Lease Obligations, Noncurrent 10,155,000 8,678,000
Maturities of long-term debt and capital lease obligations [Abstract]    
2014 4,551,000  
2015 3,680,000  
2016 3,090,000  
2017 2,459,000  
2018 662,000  
Thereafter 264,000  
Long-Term Debt and Capital Lease Obligations 14,706,000 12,435,000
Financial and Other Covenants [Abstract]    
Tangible net worth 1,000,000  
Debt Instrument, Convertible, Conversion Ratio 1  
Bank Line of Credit due August 2014 [Member]
   
Promissory Notes [Abstract]    
Borrowing capacity 1,000,000  
Long-Term Debt and Capital Lease Obligations [Abstract]    
Description of variable rate basis prime  
Basis spread (in hundredths) 2.00%  
Interest rate (in hundredths) 7.00%  
Floor interest rate (in hundredths) 7.00%  
Bank Line of Credit due August 2014 [Member] | Note Collateralized by First and Second Position on All Assets of The Company [Member]
   
Promissory Notes [Abstract]    
Promissory Notes 964,000 462,000
Bank Line of Credit due April 2015 [Member]
   
Promissory Notes [Abstract]    
Borrowing capacity 2,500,000  
Bank Line of Credit due April 2015 [Member] | Note Collateralized by First and Second Position on All Assets of The Company [Member]
   
Promissory Notes [Abstract]    
Promissory Notes 413,000 0
Note Payable Due February 2016 [Member] | Notes Collateralized by Aircraft Security Agreements [Member]
   
Long-Term Debt and Capital Lease Obligations [Abstract]    
Long-Term Debt and Capital Lease Obligations 1,008,000 1,325,000
Maturities of long-term debt and capital lease obligations [Abstract]    
Long-Term Debt and Capital Lease Obligations 1,008,000 1,325,000
Note Payable Due May 2017 & 2016 [Member] | Notes Collateralized by Aircraft Security Agreements [Member]
   
Long-Term Debt and Capital Lease Obligations [Abstract]    
Long-Term Debt and Capital Lease Obligations 301,000 0
Maturities of long-term debt and capital lease obligations [Abstract]    
Long-Term Debt and Capital Lease Obligations 301,000 0
Note Payable Due September 2017 [Member] | Notes Collateralized by Aircraft Security Agreements [Member]
   
Long-Term Debt and Capital Lease Obligations [Abstract]    
Long-Term Debt and Capital Lease Obligations 428,000 511,000
Basis spread (in hundredths) 3.00%  
Floor interest rate (in hundredths) 6.25%  
Maturities of long-term debt and capital lease obligations [Abstract]    
Long-Term Debt and Capital Lease Obligations 428,000 511,000
Note Payable Due September 2017 [Member] | Note collateralized by Aircraft and Engine Security Agreements [Member]
   
Long-Term Debt and Capital Lease Obligations [Abstract]    
Description of variable rate basis prime  
Note Payable Due August 2019 [Member] | Note Collateralized By Real Estate [Member]
   
Long-Term Debt and Capital Lease Obligations [Abstract]    
Long-Term Debt and Capital Lease Obligations 368,000 412,000
Description of variable rate basis prime  
Interest rate (in hundredths) 3.36%  
Maturities of long-term debt and capital lease obligations [Abstract]    
Long-Term Debt and Capital Lease Obligations 368,000 412,000
Note Payable Due March 2019 [Member] | Note Collateralized By Real Estate [Member]
   
Long-Term Debt and Capital Lease Obligations [Abstract]    
Long-Term Debt and Capital Lease Obligations 373,000 473,000
Description of variable rate basis prime  
Interest rate (in hundredths) 3.36%  
Maturities of long-term debt and capital lease obligations [Abstract]    
Long-Term Debt and Capital Lease Obligations 373,000 473,000
Note Payable Due March 2019 [Member] | Note Collateralized By Real Estate [Member]
   
Long-Term Debt and Capital Lease Obligations [Abstract]    
Long-Term Debt and Capital Lease Obligations 949,000 1,059,000
Description of variable rate basis prime  
Interest rate (in hundredths) 2.70%  
Maturities of long-term debt and capital lease obligations [Abstract]    
Long-Term Debt and Capital Lease Obligations 949,000 1,059,000
Note Payable Due November 2012 [Member] | Note Collateralized By Real Estate [Member]
   
Long-Term Debt and Capital Lease Obligations [Abstract]    
Long-Term Debt and Capital Lease Obligations 0 40,000
Interest rate (in hundredths) 7.50%  
Maturities of long-term debt and capital lease obligations [Abstract]    
Long-Term Debt and Capital Lease Obligations 0 40,000
Note Payable Due June 14, 2014 [Member] | Note Collateralized By Real Estate [Member]
   
Long-Term Debt and Capital Lease Obligations [Abstract]    
Long-Term Debt and Capital Lease Obligations 333,000 345,000
Interest rate (in hundredths) 6.25%  
Maturities of long-term debt and capital lease obligations [Abstract]    
Long-Term Debt and Capital Lease Obligations 333,000 345,000
Note Payable Due January 2014 [Member] | Note Collateralized by First and Second Position on All Assets of The Company [Member]
   
Long-Term Debt and Capital Lease Obligations [Abstract]    
Long-Term Debt and Capital Lease Obligations 202,000 454,000
Description of variable rate basis prime  
Basis spread (in hundredths) 2.00%  
Floor interest rate (in hundredths) 7.00%  
Maturities of long-term debt and capital lease obligations [Abstract]    
Long-Term Debt and Capital Lease Obligations 202,000 454,000
Note Payable Due May 2014 [Member] | Note Collateralized by First and Second Position on All Assets of The Company [Member]
   
Long-Term Debt and Capital Lease Obligations [Abstract]    
Interest rate (in hundredths) 7.00%  
Note Payable Due May 2014 [Member] | Note collateralized by Aircraft and Engine Security Agreements [Member]
   
Long-Term Debt and Capital Lease Obligations [Abstract]    
Long-Term Debt and Capital Lease Obligations 219,000 435,000
Description of variable rate basis Libor  
Basis spread (in hundredths) 9.715%  
Interest rate (in hundredths) 9.96%  
Maturities of long-term debt and capital lease obligations [Abstract]    
Long-Term Debt and Capital Lease Obligations 219,000 435,000
Obligation of BHCMC, LLC Due October 2017 [Member]
   
Long-Term Debt and Capital Lease Obligations [Abstract]    
Long-Term Debt and Capital Lease Obligations 2,312,000 0
Interest rate (in hundredths) 12.00%  
Maturities of long-term debt and capital lease obligations [Abstract]    
Long-Term Debt and Capital Lease Obligations 2,312,000 0
Obligation of BHCMC, LLC Due December 2016 [Member]
   
Long-Term Debt and Capital Lease Obligations [Abstract]    
Long-Term Debt and Capital Lease Obligations 5,949,000 7,081,000
Interest rate (in hundredths) 15.00%  
Maturities of long-term debt and capital lease obligations [Abstract]    
Long-Term Debt and Capital Lease Obligations 5,949,000 7,081,000
Obligation of BHCMC, LLC Due August 2016 [Member]
   
Long-Term Debt and Capital Lease Obligations [Abstract]    
Long-Term Debt and Capital Lease Obligations 2,127,000 0
Maturities of long-term debt and capital lease obligations [Abstract]    
Long-Term Debt and Capital Lease Obligations 2,127,000 0
Other Notes Payable and Capital Lease Obligations Due Nov 2013 to June 2016 [Member]
   
Long-Term Debt and Capital Lease Obligations [Abstract]    
Long-Term Debt and Capital Lease Obligations 137,000 300,000
Interest rate, minimum (in hundredths) 5.80%  
Interest rate, maximum (in hundredths) 6.20%  
Maturities of long-term debt and capital lease obligations [Abstract]    
Long-Term Debt and Capital Lease Obligations $ 137,000 $ 300,000