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Note 2 - Stock-based Compensation | 6 Months Ended
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Jun. 30, 2016
Notes to Financial Statements |
Disclosure of Compensation Related Costs, Share-based Payments [Text Block] | Note 2 : Stock-Based Compensation The Company’s 1999 Stock Option Plan 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 un-exercised stock options expired in November 2015. There were 4,000 stock options exercised during the six months ended June 30, 2015.
Options |  | Shares |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Term |  |  | Aggregate Intrinsic Value |
Outstanding at January 1, 2015 |  |  | 20,500 |  |  | $ | 23.00 |  |  |  |  |  |  |  |  |
Exercised |  |  | (4,000 | ) |  |  | 23.00 |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | --- |  |  |  | --- |  |  |  |  |  |  |  |  |
Outstanding at June 30, 2015 |  |  | 16,500 |  |  | $ | 23.00 |  |  |  | 0.359 |  |  | $ | 103 |
Exercisable at June 30, 2015 |  |  | 16,500 |  |  | $ | 23.00 |  |  |  | 0.359 |  |  | $ | 103 |

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