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Note 4 - Investments - Investment in Common Stock Warrants (Details) (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2015
Gain on investment in common stock warrants $ (30,000)us-gaap_FairValueAdjustmentOfWarrants  
Ending balance   2,307,000us-gaap_AvailableForSaleSecuritiesCurrent
Warrant [Member]    
Beginning balance 350,000us-gaap_AvailableForSaleSecuritiesCurrent
/ us-gaap_InvestmentTypeAxis
= us-gaap_WarrantMember		   
Gain on investment in common stock warrants 30,000us-gaap_FairValueAdjustmentOfWarrants
/ us-gaap_InvestmentTypeAxis
= us-gaap_WarrantMember		   
Fair value of warrants exercised (380,000)apt_FairiValueOfWarrantsExercised
/ us-gaap_InvestmentTypeAxis
= us-gaap_WarrantMember		   
Ending balance