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Note 18 - Employee Benefit Plans (Detail) (USD $) | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Maximum [Member] | Dec. 31, 2012 Minimum [Member] | Mar. 31, 2010 First Five Percent of Eligible Compensation [Member] | Mar. 31, 2010 Matched at 100% [Member] | Dec. 31, 2012 Matched at 100% [Member] | Mar. 31, 2010 Less Than Two Years of Service [Member] | Mar. 31, 2010 Yearly After Two Years of Service [Member] | Dec. 31, 2012 First Two and Half Percent of Eligible Compensation [Member]
Minimum Number Of Years Allowed To Participate In Employee Stock Ownership Plan | 2 years |  |  |  |  |  |  |  |  |  |
Minimum number of hours allowed to participate in employee stock ownership plan for part-time employees | 1000 years |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in Shares) | 2,814 | 3,437 | 4,881 |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Employee Stock Purchase Plan (in Dollars) | $ 47,000 | $ 47,000 | $ 51,000 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares) | 116,124 | 83,020 | 171,689 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares) |  | 1,188,741 |  |  |  |  |  |  |  |  |
Percentage Of Outstanding Common Stock Under Employee Stock Ownership Plan |  | 1.50% |  |  |  |  |  |  |  |  |
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Percent | 75.00% |  |  |  |  |  | 5.00% | 2.50% |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent |  |  |  |  |  | 100.00% |  |  |  |  | 100.00%
Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage |  |  |  |  |  |  |  |  | 0.00% | 25.00% |
Defined Contribution Plan, Employer Discretionary Contribution Amount (in Dollars) | 1,000,000 | 900,000 | 900,000 |  |  |  |  |  |  |  |
Percentage of Participant Borrowing Capacity of Vested Amount | 50.00% |  |  |  |  |  |  |  |  |  |
Employee Stock Ownership Plan (ESOP), Debt Structure, Direct Loan, Employer Cash Payments Used for Debt Service (in Dollars) |  |  |  | $ 50,000 | $ 1,000 |  |  |  |  |  |

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- Definition Percentage of outstanding common stock under employee stock ownership plan + References No definition available. + Details
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- Definition The amount of cash provided by the employer through contributions or dividends that the ESOP used in the period to repay debt and interest on a third-party loan made directly to the ESOP. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 25 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6418455&loc=d3e16545-113920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 93-6 -Paragraph 25 -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
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a -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 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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