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Note 2 - Summary of Significant Accounting Policies (Details) - Fair Value of Financial Assets (USD $)
Dec. 31, 2014
Dec. 31, 2013
Assets:    
Investment $ 2,840,000us-gaap_AvailableForSaleSecuritiesCurrent $ 1,606,000us-gaap_AvailableForSaleSecuritiesCurrent
Marketable Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets:    
Investment 2,840,000us-gaap_AvailableForSaleSecuritiesCurrent
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_InvestmentTypeAxis
= apt_MarketableSecuritiesMember		 1,256,000us-gaap_AvailableForSaleSecuritiesCurrent
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_InvestmentTypeAxis
= apt_MarketableSecuritiesMember
Marketable Securities [Member]    
Assets:    
Investment 2,840,000us-gaap_AvailableForSaleSecuritiesCurrent
/ us-gaap_InvestmentTypeAxis
= apt_MarketableSecuritiesMember		 1,256,000us-gaap_AvailableForSaleSecuritiesCurrent
/ us-gaap_InvestmentTypeAxis
= apt_MarketableSecuritiesMember
Warrant [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets:    
Investment   350,000us-gaap_AvailableForSaleSecuritiesCurrent
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_WarrantMember
Warrant [Member]    
Assets:    
Investment   $ 350,000us-gaap_AvailableForSaleSecuritiesCurrent
/ us-gaap_InvestmentTypeAxis
= us-gaap_WarrantMember