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DEBT (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Apr. 30, 2015
Apr. 30, 2015
Apr. 30, 2014
Promissory Notes [Abstract]      
Promissory Notes $ 1,510 $ 1,510 $ 1,757
Long-Term Debt and Capital Lease Obligations [Abstract]      
Long-Term Debt and Capital Lease Obligations 9,282 9,282 10,728
Less: Current maturities 2,412 2,412 3,908
Long-Term Debt and Capital Lease Obligations, Noncurrent 6,870 6,870 6,820
Maturities of long-term debt and capital lease obligations [Abstract]      
2014 2,412 2,412  
2015 2,285 2,285  
2016 1,577 1,577  
2017 1,576 1,576  
2018 1,328 1,328  
Thereafter 104 104  
Long-Term Debt and Capital Lease Obligations 9,282 9,282 10,728
Financial and Other Covenants [Abstract]      
Tangible net worth 1,000 $ 1,000  
Debt instrument, convertible, conversion ratio   1.0  
Note Collateralized By Real Estate [Member]      
Promissory Notes [Abstract]      
Promissory Notes 154 $ 154 150
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 700 700 908
Borrowing capacity $ 1,000 $ 1,000  
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% 7.00%  
Floor interest rate (in hundredths) 7.00% 7.00%  
Maturity date   Aug. 31, 2014  
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 $ 656 $ 656 699
Borrowing capacity $ 2,500 $ 2,500  
Long-Term Debt and Capital Lease Obligations [Abstract]      
Interest rate (in hundredths) 6.00% 6.00%  
Maturity date   Apr. 30, 2015  
Note Payable Due February 2016 [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 $ 314 $ 314 671
Interest rate (in hundredths) 6.00% 6.00%  
Maturity date   Feb. 29, 2016  
Maturities of long-term debt and capital lease obligations [Abstract]      
Long-Term Debt and Capital Lease Obligations $ 314 $ 314 671
Note Payable Due May 2017 & 2016 [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 $ 159 $ 159 232
Interest rate (in hundredths) 6.00% 6.00%  
Maturity date range, start   May 31, 2016  
Maturity date range, end   May 31, 2017  
Maturities of long-term debt and capital lease obligations [Abstract]      
Long-Term Debt and Capital Lease Obligations $ 159 $ 159 232
Note Payable Due September 2017 [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 $ 249 $ 249 342
Description of variable rate basis   prime  
Basis spread (in hundredths)   3.00%  
Floor interest rate (in hundredths) 6.25% 6.25%  
Maturity date   Sep. 30, 2017  
Maturities of long-term debt and capital lease obligations [Abstract]      
Long-Term Debt and Capital Lease Obligations $ 249 $ 249 342
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 $ 253 $ 253 312
Description of variable rate basis   prime  
Interest rate (in hundredths) 3.36% 3.36%  
Maturity date   Aug. 31, 2019  
Maturities of long-term debt and capital lease obligations [Abstract]      
Long-Term Debt and Capital Lease Obligations $ 253 $ 253 312
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 $ 261 $ 261 323
Description of variable rate basis   prime  
Interest rate (in hundredths) 3.36% 3.36%  
Maturity date   Mar. 31, 2019  
Maturities of long-term debt and capital lease obligations [Abstract]      
Long-Term Debt and Capital Lease Obligations $ 261 $ 261 323
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 $ 628 $ 628 788
Description of variable rate basis   prime  
Interest rate (in hundredths) 2.65% 2.65%  
Maturity date   Mar. 31, 2019  
Maturities of long-term debt and capital lease obligations [Abstract]      
Long-Term Debt and Capital Lease Obligations $ 628 $ 628 788
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 $ 306 $ 306 320
Interest rate (in hundredths) 6.25% 6.25%  
Maturity date   Jun. 14, 2015  
Maturities of long-term debt and capital lease obligations [Abstract]      
Long-Term Debt and Capital Lease Obligations $ 306 $ 306 320
Obligation of BHCMC, LLC Due October 2017 [Member]      
Long-Term Debt and Capital Lease Obligations [Abstract]      
Long-Term Debt and Capital Lease Obligations $ 0 $ 0 1,900
Interest rate (in hundredths) 12.00% 12.00%  
Maturity date   Oct. 31, 2017  
Maturities of long-term debt and capital lease obligations [Abstract]      
Long-Term Debt and Capital Lease Obligations $ 0 $ 0 1,900
Obligation of BHCMC, LLC Due December 2016 [Member]      
Long-Term Debt and Capital Lease Obligations [Abstract]      
Long-Term Debt and Capital Lease Obligations $ 0 $ 0 4,634
Interest rate (in hundredths) 15.00% 15.00%  
Maturity date   Dec. 31, 2016  
Maturities of long-term debt and capital lease obligations [Abstract]      
Long-Term Debt and Capital Lease Obligations $ 0 $ 0 4,634
Obligation of BHCMC, LLC Due August 2014 [Member]      
Long-Term Debt and Capital Lease Obligations [Abstract]      
Long-Term Debt and Capital Lease Obligations 895 $ 895 1,126
Maturity date      
Maturities of long-term debt and capital lease obligations [Abstract]      
Long-Term Debt and Capital Lease Obligations 895 $ 895 1,126
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 43 $ 43 80
Interest rate, minimum (in hundredths)      
Interest rate, maximum (in hundredths)      
Maturity date range, start      
Maturity date range, end      
Maturities of long-term debt and capital lease obligations [Abstract]      
Long-Term Debt and Capital Lease Obligations 43 $ 43 80
buks_DebtInstrumentDueJanuaryTwoThousandTwenty [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 674 $ 674 0
Maturity date   Jan. 31, 2020  
Maturities of long-term debt and capital lease obligations [Abstract]      
Long-Term Debt and Capital Lease Obligations 674 $ 674 0
Debt instrument due May two thousand twenty [Member] | Note collateralized by BNSC's assets and compensation due under State Mgmt Contract [Member]      
Long-Term Debt and Capital Lease Obligations [Abstract]      
Long-Term Debt and Capital Lease Obligations $ 5,500 $ 5,500 0
Interest rate (in hundredths) 4.89% 4.89%  
Maturity date   May 30, 2020  
Maturities of long-term debt and capital lease obligations [Abstract]      
Long-Term Debt and Capital Lease Obligations $ 5,500 $ 5,500 $ 0