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Note 7 - Defined Benefit Plan | 3 Months Ended
--- | ---
Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract] |
Pension and Other Postretirement Benefits Disclosure [Text Block] | Note 7: Defined Benefit Plan Components of Net Periodic Benefit Cost
|  | Pension Benefits |
|  | Three Months Ended March 31, |
|  | 2015 |  |  | 2014 |
Service cost |  | $ | 155 |  |  | $ | 131 |
Interest cost |  |  | 167 |  |  |  | 166 |
Expected return on plan assets |  |  | (292 | ) |  |  | (278 | )
Amortization of prior service cost |  |  | (27 | ) |  |  | (27 | )
Recognized net actuarial loss |  |  | 104 |  |  |  | 65 |
Net periodic benefit cost |  | $ | 107 |  |  | $ | 57 |
2015 Plan Year Employer Contribution Without considering the prefunding balance, the Company’s minimum required contribution to the National Bankshares, Inc. Retirement Income Plan (the “Plan”) is $0. Considering the prefunding balance, the 2015 minimum required contribution is $0. The Company elected to contribute $0 to the Plan during the three months ended March 31, 2015.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2410-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450702-114947 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414199&loc=d3e39622-114963 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39675-114964 + Details
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