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Note 7 - Share-based Compensation (Details Textual) (USD $)
3 Months Ended 9 Months Ended 1 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Aug. 31, 2014
Dec. 31, 2013
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense $ 0us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense $ 0us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense $ 0us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense $ 0us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount 0us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount 0us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount 0us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount 0us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue          
Proceeds from Stock Options Exercised 0us-gaap_ProceedsFromStockOptionsExercised          
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options 0us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions          
Allocated Share-based Compensation Expense 600,000us-gaap_AllocatedShareBasedCompensationExpense 500,000us-gaap_AllocatedShareBasedCompensationExpense 1,600,000us-gaap_AllocatedShareBasedCompensationExpense 1,400,000us-gaap_AllocatedShareBasedCompensationExpense    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period     447,777us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 4,100,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized   $ 4,100,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 2 years          
Performance-based Stock Options [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period         413,675us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod
/ us-gaap_AwardTypeAxis
= bota_PerformanceBasedStockOptionsMember
 
MSU [Member] | Minimum [Member]            
Percentage of the Target Number of Units Granted Earned Based on Stock Performance     0.00%bota_PercentageOfTheTargetNumberOfUnitsGrantedEarnedBasedOnStockPerformance
/ us-gaap_AwardTypeAxis
= bota_MSUMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
MSU [Member] | Maximum [Member]            
Percentage of the Target Number of Units Granted Earned Based on Stock Performance     250.00%bota_PercentageOfTheTargetNumberOfUnitsGrantedEarnedBasedOnStockPerformance
/ us-gaap_AwardTypeAxis
= bota_MSUMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
     
MSU [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period           108,183us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= bota_MSUMember