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Note 3 - Investments (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Note 3 - Investments (Details) [Line Items]    
Available-for-sale Securities, Current $ 2,840,000us-gaap_AvailableForSaleSecuritiesCurrent $ 1,606,000us-gaap_AvailableForSaleSecuritiesCurrent
Proceeds from Sale and Maturity of Marketable Securities 440,000us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities 0us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities
Marketable Securities, Realized Gain (Loss) 379,000us-gaap_MarketableSecuritiesRealizedGainLoss  
Marketable Securities, Realized Gain (Loss), Net of Tax 245,000apt_MarketableSecuritiesRealizedGainLossNetOfTax  
Marketable Securities, Unrealized Gain (Loss) 995,000us-gaap_MarketableSecuritiesUnrealizedGainLoss 601,000us-gaap_MarketableSecuritiesUnrealizedGainLoss
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax 536,000us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax 361,000us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in Shares) 167,500us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights  
Marketable Securities [Member]    
Note 3 - Investments (Details) [Line Items]    
Available-for-sale Securities, Current 2,840,000us-gaap_AvailableForSaleSecuritiesCurrent
/ us-gaap_InvestmentTypeAxis
= apt_MarketableSecuritiesMember
1,256,000us-gaap_AvailableForSaleSecuritiesCurrent
/ us-gaap_InvestmentTypeAxis
= apt_MarketableSecuritiesMember
Warrant [Member]    
Note 3 - Investments (Details) [Line Items]    
Available-for-sale Securities, Current   $ 350,000us-gaap_AvailableForSaleSecuritiesCurrent
/ us-gaap_InvestmentTypeAxis
= us-gaap_WarrantMember