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Note 7 - Defined Benefit Plan | 6 Months Ended
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Jun. 30, 2013
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 |
|  | Six Months Ended June 30, |
|  | 2013 |  |  | 2012 |
Service cost |  | $ | 298 |  |  | $ | 234 |
Interest cost |  |  | 308 |  |  |  | 370 |
Expected return on plan assets |  |  | (492 | ) |  |  | (538 | )
Amortization of prior service cost |  |  | (50 | ) |  |  | (50 | )
Recognized net actuarial loss |  |  | 266 |  |  |  | 254 |
Net Periodic Benefit Cost |  | $ | 330 |  |  | $ | 270 |
2013 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 $815. Considering the prefunding balance, the 2013 minimum required contribution is $0. The Company elected to contribute $346 to the Plan during the six months ended June 30, 2013.

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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 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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