Note 1. Organization and Summary of Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2012
Accounting Policies [Abstract]
Number of Operating Segments	1
New Accounting Pronouncement or Change in Accounting Principle, Name	RECENTLY ISSUED AND ADOPTED ACCOUNTING GUIDANCE: In May 2011, the Financial Accounting Standards Board ("FASB") issued an amendment to achieve common fair value measurement and disclosure requirements between U.S. and International accounting principles.Overall, the guidance is consistent with existing U.S. accounting principles; however, there are some amendments that change a particular principle or requirement for measuring fair value or for disclosing information about fair value measurements. Other than the additional disclosure requirements, the adoption of this guidance had no impact on the financial statements. In June 2011, the FASB amended existing guidance and eliminated the option to present the components of other comprehensive income as part of the statement of changes in shareholders' equity.The amendment requires that comprehensive income be presented in either a single continuous statement or in two separate consecutive statements. The adoption of this guidance had no impact on the financial statements or disclosure as the Trust had no components of comprehensive income at December 31, 2012 or 2011.

Describe the name or caption for the new accounting pronouncement or change in accounting principle.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 154

-Paragraph 2, 17, 18

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 250

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6801783&loc=d3e22580-107794

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Accounting Change

-URI http://asc.fasb.org/extlink&oid=6503790

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Direct Effects of a Change in Accounting Principle

-URI http://asc.fasb.org/extlink&oid=6510796

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Indirect Effects of a Change in Accounting Principle

-URI http://asc.fasb.org/extlink&oid=6515603

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Change in Accounting Principle

-URI http://asc.fasb.org/extlink&oid=6507316

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 250

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6801783&loc=d3e22499-107794

Reference 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 250

-SubTopic 10

-Section S99

-Paragraph 5

-Subparagraph (SAB TOPIC 11.M)

-URI http://asc.fasb.org/extlink&oid=6369664&loc=d3e31137-122693

Reference 9: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 11

-Section M

Reference 10: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 250

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6801783&loc=d3e22583-107794

+ Details

USA REAL ESTATE INVESTMENT TRUST /CA 10-K