Note 6 - Fair Value Measurements (Details Textual) - USD ($)	3 Months Ended	12 Months Ended
Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Fair Value, Inputs, Level 2 [Member] \| Under Commitment to Sell [Member]
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Mortgage	$ 62,200,000		$ 92,600,000
Fair Value, Inputs, Level 2 [Member] \| Not Under Commitment to Sell [Member]
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Mortgage	20,000,000		23,100,000
Fair Value, Inputs, Level 2 [Member]
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Mortgage	82,193,000		115,670,000
Financial Services [Member]
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Mortgage	82,193,000		115,670,000
Gain (Loss) on Sale of Mortgage Loans	$ 5,600,000	$ 4,400,000
Minimum [Member]
Short Term Borrowings Maturity Period	30 days
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net	$ 431,000	$ 0
Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss), Net of Tax	8,100,000		5,900,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 925,000		$ 882,000

Number of days from date of origination to date of sale of loan.

No definition available.

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- Definition

The change in unrealized holding gain (loss), net of tax, on available-for-sale securities included in a separate component of shareholders' equity during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563

+ Details

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- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563

+ Details

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- Definition

The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of loans made to finance real estate acquisitions. This element refers to the gain (loss) and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

+ Details

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- Definition

Amount, after allowance for bad debt, of mortgage loan receivables held-for-sale that are not part of a disposal group. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=65884687&loc=d3e4428-111522

+ Details

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- Definition

The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 8B
-URI http://asc.fasb.org/extlink&oid=73527792&loc=SL6284393-111563

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- Details

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- Details

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