Preferred Stock (Details)	1 Months Ended
Jun. 30, 2010
Preferred Stock (Textuals) [Abstract]
Redemption price as a percentage of Series A preferred stock stated value per share	101.00%

Name:

bexp_RedeemableSeriesPreferredStockRedemptionPrice

Namespace Prefix:

bexp

Data Type:

us-types:percentItemType

Balance Type:

na

Period Type:

duration