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Note 9 - Stock Option Plan | 12 Months Ended
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Dec. 31, 2017
Notes to Financial Statements |
Disclosure of Compensation Related Costs, Share-based Payments [Text Block] | Note 9 : Stock Option Plan The Company’s 1999 Stock Option Plan was adopted in 1999 and 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 stock options granted under the plan have been exercised or expired. There were no shares available for exercise during 2017 or 2016. In 2015, there were 7,500 shares exercised with an intrinsic value of $54. 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 2015.

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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 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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