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Note 6 - Licenses, Royalty Collaborative and Contractual Arrangements (Details Textual) (USD $)
In Millions, unless otherwise specified
1 Months Ended 0 Months Ended 6 Months Ended
Mar. 31, 2011
Jan. 15, 2015
Dec. 31, 2014
Jun. 30, 2014
Contract Receivable     7.4us-gaap_AccountsReceivableBilledForLongTermContractsOrPrograms $ 17.8us-gaap_AccountsReceivableBilledForLongTermContractsOrPrograms
BARDA [Member]        
Maximum Revenue From Contract 231.2bota_MaximumRevenueFromContract
/ us-gaap_CounterpartyNameAxis
= bota_BARDAMember
     
Contract Term 5 years      
Contract Receivable     7.4us-gaap_AccountsReceivableBilledForLongTermContractsOrPrograms
/ us-gaap_CounterpartyNameAxis
= bota_BARDAMember
 
BARDA [Member] | Subsequent Event [Member]        
Proceeds from Collection of Other Receivables   $ 5.4us-gaap_ProceedsFromCollectionOfOtherReceivables
/ us-gaap_CounterpartyNameAxis
= bota_BARDAMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Daiichi Sankyo [Member] | Japan [Member]        
Royalty Payment Percentage     4.00%bota_RoyaltyPaymentPercentage
/ us-gaap_CounterpartyNameAxis
= bota_DaiichiSankyoMember
/ us-gaap_StatementGeographicalAxis
= bota_JapanMember
 
GSK [Member] | Australia, New Zealand, South Africa, and Indonesia [Member]        
Royalty Payment Percentage     10.00%bota_RoyaltyPaymentPercentage
/ us-gaap_CounterpartyNameAxis
= bota_GSKMember
/ us-gaap_StatementGeographicalAxis
= bota_AustraliaNewZealandSouthAfricaAndIndonesiaMember
 
GSK [Member] | United States, Europe, Japan, And Other Countries [Member]        
Royalty Payment Percentage     7.00%bota_RoyaltyPaymentPercentage
/ us-gaap_CounterpartyNameAxis
= bota_GSKMember
/ us-gaap_StatementGeographicalAxis
= bota_UnitedStatesEuropeJapanAndOtherCountriesMember