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Balance Sheets (Unaudited) (Parentheticals) (USD $)
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Jun. 30, 2011
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Dec. 31, 2010
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| Certificates of Proprietary Interest, par value | $ 100 | $ 100 |
| Certificates of Proprietary Interest, outstanding (in Shares) | 0 | 0 |
| Sub-share Certificates in Certificates of Proprietary Interest, par value | $ 0.03 | $ 0.03 |
| Sub-share Certificates in Certificates of Proprietary Interest, outstanding (in Shares) | 9,381,801 | 9,548,444 |
| X | ||||||||||
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- Definition
Face amount or stated value of common stock per share; generally not indicative of the fair market value per share. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Total number of shares of common stock held by shareholders. May be all or portion of the number of common shares authorized. These shares represent the ownership interest of the common shareholders. Shares outstanding equals shares issued minus shares held in treasury and other adjustments, if any. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Face amount or stated value per share of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer); generally not indicative of the fair market value per share. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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