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Note 11 - Federal Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($) | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Deferred income tax assets |  |
Allowance for loan losses | $ 6,286,000 | $ 5,488,000
Deferred compensation | 1,175,000 | 1,367,000
Stock compensation | 786,000 | 767,000
Nonaccrual loan interest income | 623,000 | 602,000
Deferred loan fees | 496,000 | 504,000
Deferred Tax Assets, Capital Loss Carryforwards | 157,000 | 270,000
Fair value write-downs on foreclosed properties | 24,000 | 115,000
Fair value of interest rate swap | 30,000 | 89,000
Unrealized loss on securities | 2,976,000 | 0
Other | 408,000 | 283,000
Deferred tax asset before valuation allowance | 12,961,000 | 9,485,000
Valuation allowance | (157,000) | (270,000)
Deferred tax asset after valuation allowance | 12,804,000 | 9,215,000
Deferred income tax liabilities |  |
Depreciation | 928,000 | 1,128,000
Prepaid expenses | 463,000 | 378,000
Core deposit intangible | 3,423,000 | 4,349,000
Mortgage loan servicing rights | 1,940,000 | 2,142,000
Unrealized gain on securities | 0 | 768,000
Business combination adjustments | 2,183,000 | 1,091,000
Other | 199,000 | 188,000
Deferred tax liability | 9,136,000 | 10,044,000
Total net deferred tax asset (liability) | $ 3,668,000 | $ (829,000)

X
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from the provision for loan losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68052875&loc=d3e28680-109314 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32621-109319 + Details
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