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Note 17 - Employee Benefit Plans (Details Textual) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Minimum Number of Years Allowed to Participate in Employee Stock Ownership Plan | 2 years |  |
Stock Issued During Period, Shares, Employee Stock Ownership Plan | 19,377 | 18,012 | 11,887
Stock Issued During Period, Value, Employee Stock Ownership Plan | $ 600,000 | $ 541,000 | $ 301,902
Employee Stock Ownership Plan (ESOP), Shares Contributed to ESOP | 103,367 | 107,202 | 73,439
Employee Stock Ownership Plan (ESOP), Shares in ESOP | 918,360 |  |
Percentage of Outstanding Common Stock under Employee Stock Ownership Plan | 1.20% |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | 75.00% |  |
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 2,100,000 | $ 2,000,000 | $ 1,400,000
Percentage of Participant Borrowing Capacity of Vested Amount | 50.00% |  |
Maximum [Member] |  |  |
Employee Stock Ownership Plan (ESOP), Debt Structure, Direct Loan, Employer Cash Payments Used for Debt Service | $ 50,000 |  |
Minimum [Member] |  |  |
Employee Stock Ownership Plan (ESOP), Debt Structure, Direct Loan, Employer Cash Payments Used for Debt Service | $ 1,000 |  |
Less than Two Years of Service [Member] |  |  |
Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage | 0.00% |  |
Yearly after Two Years of Service [Member] |  |  |
Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage | 25.00% |  |
Matched at 100 Percent [Member] |  |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | 4.00% |  |

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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution 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=65888597&loc=d3e16545-113920 + Details
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- Definition This item represents the number of shares provided to the Employee Stock Ownership Plan (ESOP) during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65895303&loc=d3e17540-113929 + Details
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