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Consolidated Statements of Cash Flows (Parenthetical) (USD $)
12 Months Ended
Dec. 31, 2013
Supplemental disclosures of non-cash transactions:  
Decreased in deferred tax assets and additional paid in capital due to cancelation of stock options $ 75,000bstc_DecreaseInDeferredTaxAssetsAndAdditionalPaidInCapitalDueToCancelationOfStockOptions
Stock options, cancelled (in shares) 15,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod