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Note 13 - Condensed Financial Statements of Parent Company (Details) - Condensed Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash Flows from Operating Expenses      
Net income $ 15,833 $ 16,914 $ 17,790
Adjustments to reconcile net income to net cash provided by operating activities:      
Amortization of premiums and accretion of discounts, net 117 138 171
Depreciation expense 749 732 726
Losses on disposal of fixed assets 15 94 (11)
Net change in other assets 420 (574) 1,760
Net change in other liabilities 963 (428) 83
Losses on securities (33) (2) 46
Cash Flows from Investing Activities      
Net change in interest-bearing deposits (28,263) (4,482) (781)
Purchases of securities available for sale (80,093) (33,905) (83,996)
Purchases of securities held to maturity 0 (6,381) (13,484)
Maturities and calls of securities available for sale 64,556 11,088 63,886
Proceeds from sale of premises and equipment 0 453 11
Cash Flows from Financing Activities      
Cash dividends paid (7,930) (7,853) (7,781)
Exercise of stock options 173 58 0
Net change in cash (742) (389) (1,500)
Parent Company [Member]      
Cash Flows from Operating Expenses      
Net income 15,833 16,914 17,790
Adjustments to reconcile net income to net cash provided by operating activities:      
Equity in undistributed net income of subsidiaries (8,533) (9,718) (10,545)
Amortization of premiums and accretion of discounts, net 1 1 0
Depreciation expense 3 9 17
Losses on disposal of fixed assets 2 94 0
Net change in refundable income taxes due from subsidiaries 106 96 77
Net change in other assets (81) (63) 3
Net change in other liabilities 128 (33) 20
Losses on securities 0 0 94
Net cash provided by operating activities 7,459 7,300 7,456
Cash Flows from Investing Activities      
Net change in interest-bearing deposits 307 213 (2)
Purchases of securities available for sale 0 0 (612)
Purchases of securities held to maturity 0 (453) 0
Maturities and calls of securities available for sale 0 455 945
Proceeds from sale of premises and equipment 0 263 0
Net cash provided by investing activities 307 478 331
Cash Flows from Financing Activities      
Cash dividends paid (7,930) (7,853) (7,781)
Exercise of stock options 173 58 0
Net cash used in financing activities (7,757) (7,795) (7,781)
Net change in cash 9 17 6
Cash due from subsidiaries at beginning of year 10 27 21
Cash due from subsidiaries at end of year $ 19 $ 10 $ 27