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Note 9 - Stock Option Plan | 12 Months Ended
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Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Disclosure of Compensation Related Costs, Share-based Payments [Text Block] | Note 9: 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, 2014 |  |  | 46,000 |  |  | $ | 23.96 |  |  |  |  |  |  |  |  |
Granted |  |  | --- |  |  |  | --- |  |  |  |  |  |  |  |  |
Exercised |  |  | (2,500 | ) |  |  | 23.00 |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (23,000 | ) |  |  | 24.93 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2014 |  |  | 20,500 |  |  | $ | 23.00 |  |  |  | 0.85 |  |  | $ | 151 |
Exercisable at December 31, 2014 |  |  | 20,500 |  |  | $ | 23.00 |  |  |  | 0.85 |  |  | $ | 151 |
In 2014, there were 2,500 shares exercised with an intrinsic value of $15. There were no shares exercised in 2013. For 2012, the intrinsic value of shares exercised was $141. Intrinsic value is the difference between the price at which the shares may be exercised and the stock price as of the report date. 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 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 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 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 5: 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 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 + Details
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