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Note 11 - Federal Income Taxes (Details) - Effective Income Tax Rate Reconciliation - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Effective Income Tax Rate Reconciliation [Abstract]
Tax at statutory rate (35%)	$ 13,591,000	$ 8,819,000	$ 8,794,000
Increase (decrease) from
Tax-exempt interest	(781,000)	(621,000)	(347,000)
Bank owned life insurance	(384,000)	(415,000)	(465,000)
Change in valuation allowance	(180,000)	0	0
Other	(435,000)	82,000	110,000
Tax expense	$ 11,811,000	$ 7,865,000	$ 8,092,000

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Amount of the difference between reported income tax expense (benefit) and expected tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from bank owned life insurance that is exempt from income taxes.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income (loss) exempt from income taxes.

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