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Stock Option Plan | 12 Months Ended
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Dec. 31, 2012
Stock Option Plan [Abstract] |
Stock Option Plan | Note 10: Stock Option Plan The Company had a stock option plan, the 1999 Stock Option Plan, that was adopted in 1999 and that was terminated on March 9, 2009. Incentive stock options were granted annually to key employees of NBI and its subsidiaries from 1999 to 2005 and none have been granted since 2005. All of the stock options are vested. A summary of the status of the Company's stock option plan is presented below:
Options |  | Shares |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term |  | Aggregate Intrinsic Value |
Outstanding at January 1, 2012 |  | 77,000 |  | $ | 22.82 |  |  |  |  |  |
Granted |  | --- |  |  | --- |  |  |  |  |  |
Exercised |  | 8,000 |  |  | 14.83 |  |  |  |  |  |
Forfeited or expired |  | --- |  |  | --- |  |  |  |  |  |
Outstanding at December 31, 2012 |  | 69,000 |  | $ | 23.75 |  | 3.83 |  | $ | 596 |
Exercisable at December 31, 2012 |  | 69,000 |  | $ | 23.75 |  | 3.83 |  | $ | 596 |
There were 8,000 shares exercised in 2012 with an intrinsic value of $141. For 2011 and 2010, the intrinsic value of shares exercised were $85 and $0, respectively. No tax benefit was recognized on shares exercised in any of these years.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 93-6 -Paragraph 53 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64, 65, A240 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 + Details
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