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Note 11 - Federal Income Taxes (Details) - Significant Components of Deferred Tax Assets and Liabilities - USD ($) | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Deferred income tax assets |  |
Allowance for loan losses | $ 5,488,000 | $ 7,014,000
Deferred compensation | 1,367,000 | 1,304,000
Stock compensation | 767,000 | 521,000
Nonaccrual loan interest income | 602,000 | 471,000
Deferred loan fees | 504,000 | 445,000
Losses on capital investments | 270,000 | 450,000
Fair value write-downs on foreclosed properties | 115,000 | 212,000
Fair value of interest rate swap | 89,000 | 89,000
Tax credit carryforwards | 0 | 3,395,000
Business combination adjustments | 0 | 315,000
Other | 283,000 | 410,000
Deferred tax asset before valuation allowance | 9,485,000 | 14,626,000
Valuation allowance | (270,000) | (450,000)
Deferred tax asset after valuation allowance | 9,215,000 | 14,176,000
Deferred income tax liabilities |  |
Depreciation | 1,128,000 | 1,217,000
Prepaid expenses | 378,000 | 425,000
Core deposit intangible | 4,349,000 | 5,386,000
Mortgage loan servicing rights | 2,142,000 | 2,349,000
Unrealized gain on securities | 768,000 | 112,000
Business combination adjustments | 1,091,000 | 0
Other | 188,000 | 476,000
Deferred tax liability | 10,044,000 | 9,965,000
Total net deferred tax asset (liability) | $ (829,000) | $ 4,211,000

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