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Note 13 - Condensed Financial Statements of Parent Company (Details) - Condensed Statements of Cash Flows (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Cash Flows from Operating Expenses |  |  |
Net income | $ 17,790 | $ 17,747 | $ 17,638
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Amortization of premiums and accretion of discounts, net | 171 | 224 | 217
Depreciation expense | 726 | 764 | 799
Net change in other assets | 1,865 | 35 | 580
Net change in other liabilities | 83 | (175) | (4,135)
Losses on securities | (59) | (104) | (90)
Cash Flows from Investing Activities |  |  |
Purchases of securities available for sale | (83,996) | (171,577) | (64,567)
Maturities and calls of securities available for sale | 63,884 | 151,051 | 74,934
Cash Flows from Financing Activities |  |  |
Cash dividends paid | (7,781) | (7,639) | (6,938)
Exercise of stock options |  | 119 | 92
Net change in cash | (1,500) | 2,886 | 2,039
NBI [Member] |  |  |
Cash Flows from Operating Expenses |  |  |
Net income | 17,790 | 17,747 | 17,638
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Equity in undistributed net income of subsidiaries | (10,545) | (10,512) | (10,757)
Amortization of premiums and accretion of discounts, net |  | 1 | 1
Depreciation expense | 17 | 12 | 9
Net change in refundable income taxes due from subsidiaries | 77 | 77 |
Net change in other assets | 3 | (199) | 147
Net change in other liabilities | 20 | (124) | (364)
Losses on securities | 94 |  |
Net cash provided by operating activities | 7,456 | 7,002 | 6,674
Cash Flows from Investing Activities |  |  |
Purchases of securities available for sale | (614) | (815) | (1,973)
Maturities and calls of securities available for sale | 945 | 1,352 | 2,250
Net cash provided by investing activities | 331 | 537 | 277
Cash Flows from Financing Activities |  |  |
Cash dividends paid | (7,781) | (7,639) | (6,938)
Exercise of stock options |  | 119 | 92
Capital distribution to subsidiary |  |  | (105)
Net cash used in financing activities | (7,781) | (7,520) | (6,951)
Net change in cash | 6 | 19 |
Cash due from subsidiaries at beginning of year | 21 | 2 | 2
Cash due from subsidiaries at end of year | $ 27 | $ 21 | $ 2

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- Definition The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations 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 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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