Note 4 - Securities Available for Sale (Detail) - Non-Agency Collateralized Mortgage Obligations (USD $)			3 Months Ended
Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2012 GSR 2003-4F 1A2 [Member] Collateralized Mortgage Obligations [Member] External Credit Rating, Investment Grade [Member]	Dec. 31, 2012 MASTR 2003-8 4A1 [Member] Collateralized Mortgage Obligations [Member] External Credit Rating, Investment Grade [Member]	Dec. 31, 2012 SARM 2004-6 3A3 [Member] Collateralized Mortgage Obligations [Member] External Credit Rating, Investment Grade [Member]	Dec. 31, 2012 CMLTI 2004-HYB1 A31 [Member] Collateralized Mortgage Obligations [Member] Split Rating [Member]	Dec. 31, 2012 MARM 2004-7 5A1 [Member] Collateralized Mortgage Obligations [Member] Split Rating [Member]	Dec. 31, 2012 MARM 2004-13 B1 [Member] Collateralized Mortgage Obligations [Member] External Credit Rating, Non Investment Grade [Member]	Dec. 31, 2012 MARM 2004-15 4A1 [Member] Collateralized Mortgage Obligations [Member] External Credit Rating, Non Investment Grade [Member]	Dec. 31, 2012 CWALT 2005-63 2A2 [Member] Collateralized Mortgage Obligations [Member] External Credit Rating, Non Investment Grade [Member]	Dec. 31, 2012 Collateralized Mortgage Obligations [Member] External Credit Rating, Investment Grade [Member]	Dec. 31, 2012 Collateralized Mortgage Obligations [Member] Split Rating [Member]	Dec. 31, 2012 Collateralized Mortgage Obligations [Member]
Cumulative Net Impairment Losses Recognized in Earnings								$ 380,000		$ 380,000			$ 380,000
Current Par Value			296,000	711,000	1,269,000	1,435,000	5,136,000	5,561,000	2,670,000	13,367,000	2,277,000	1,435,000	17,079,000
Book Value	179,246,182	189,379,333	296,000	706,000	1,269,000	1,435,000	5,136,000	5,181,000	2,670,000	12,987,000	2,271,000	1,435,000	16,693,000
Market Value	179,246,182	189,379,333	301,000	726,000	1,047,000	1,486,000	4,503,000	3,052,000	2,444,000	9,999,000	2,074,000	1,486,000	13,559,000
Unrealized Gain (Loss)			5,000	20,000	(222,000)	51,000	(633,000)	(2,129,000)	(226,000)	(2,988,000)	(197,000)	51,000	(3,134,000)
Market Value	$ 179,246,182	$ 189,379,333

Accumulated other comprehensive loss related to portion of other than temporary impairment (OTTI) due to factors other than credit losses on debt securities categorized as available-for-sale that an entity does not intend to sell and which it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis of the debt security. The amount represented by this item is net of tax, as applicable.

+ References+ Details

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

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

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FAS115-1/124-1

-Paragraph 15D

-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 Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 12

-Subparagraph b

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 16

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

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FAS115-1/124-1

-Paragraph 15C

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558

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

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FAS115-1/124-1

-Paragraph 15E

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 13

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 14

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 22

-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.

+ Details

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

+ References+ Details