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Note 2 - Stock-based Compensation | 6 Months Ended
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Jun. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
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 of the stock options are vested.
Options |  | Shares |  |  | Weighted Average Exercise Price Per Share |  |  | 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 June 30, 2015 |  |  | 16,500 |  |  | $ | 23.00 |  |  |  | 0.359 |  |  | $ | 103 |
Exercisable at June 30, 2015 |  |  | 16,500 |  |  | $ | 23.00 |  |  |  | 0.359 |  |  | $ | 103 |
Options |  | Shares |  |  | Weighted Average Exercise Price Per Share |  |  | Weighted Average Remaining Contractual Term |  |  | Aggregate Intrinsic Value |
Outstanding at January 1, 2014 |  |  | 46,000 |  |  | $ | 23.96 |  |  |  |  |  |  |  |  |
Exercised |  |  | (2,500 | ) |  |  | 23.00 |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (23,000 | ) |  |  | 24.93 |  |  |  |  |  |  |  |  |
Outstanding December 31, 2014 |  |  | 20,500 |  |  | $ | 23.00 |  |  |  | 0.85 |  |  | $ | 151 |
Exercisable at December 31, 2014 |  |  | 20,500 |  |  | $ | 23.00 |  |  |  | 0.85 |  |  | $ | 151 |
There were 4,000 shares with an intrinsic value of $23 exercised during the six months ended June 30, 2015. There were 2,500 shares with an intrinsic value of $15 exercised in 2014.

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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 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 2: 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=51659978&loc=d3e25284-112666 Reference 3: 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 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 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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