2.4.0.8000100 - Disclosure - 3. Investment in Pemberwick Fundtruefalsefalse1false falsefalseD130331_130629http://www.sec.gov/CIK0000897315duration2013-03-31T00:00:002013-06-29T00:00:001true 1us-gaap_DisclosureTextBlockAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Notes2false 2fil_InvestmentInPemberwickFundfil_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse003.      Investment in Pemberwick Fund   The Trust carries its investment in Pemberwick Fund, a short duration bond fund (Pemberwick) at estimated fair value. The fair value of the Trusts investment in Pemberwick is classified within Level 1 of the fair value hierarchy of the guidance on Fair Value Measurements as defined in Accounting Standards Codification (ASC) Topic 820. Level 1 inputs utilize quoted prices (unadjusted) in active markets for identical assets or liabilities that the Trust has the ability to access. Pemberwicks net asset value (NAV) is $10.06 per share as of June 29, 2013. An unrealized gain of $4,930 is reflected as accumulated other comprehensive income in the accompanying unaudited balance sheet as of June 29, 2013. As of June 29, 2013, the Trust has earned $38,874 of interest revenue from its investment in Pemberwick.falsefalsefalsenonnum:textBlockItemTypenaNo authoritative reference available.No definition available.false03. Investment in Pemberwick Fundfalse3. Investment in Pemberwick FundUnKnownUnKnownUnKnownUnKnowntruefalsefalseSheethttp://atctixbrl.com/20130629/role/idr_Disclosure3InvestmentInPemberwickFund12