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Note 12 - Minimum Regulatory Capital Requirement (Tables) | 12 Months Ended
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Dec. 31, 2014
Disclosure Text Block [Abstract] |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] |
|  | Actual |  |  | Minimum Capital Requirement |  |  | Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions |
|  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |
December 31, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total capital (to risk weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
NBI consolidated |  | $ | 172,976 |  |  |  | 24.9 | % |  | $ | 55,615 |  |  |  | 8.00 | % |  | N/A |  |  | N/A |
NBB |  |  | 170,665 |  |  |  | 24.6 | % |  |  | 55,438 |  |  |  | 8.00 | % |  | $ | 69,298 |  |  |  | 10.00 | %
Tier 1 capital (to risk weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
NBI consolidated |  | $ | 164,713 |  |  |  | 23.7 | % |  | $ | 27,807 |  |  |  | 4.00 | % |  | N/A |  |  | N/A |
NBB |  |  | 162,402 |  |  |  | 23.4 | % |  |  | 27,719 |  |  |  | 4.00 | % |  | $ | 41,579 |  |  |  | 6.00 | %
Tier 1 capital (to average assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
NBI consolidated |  | $ | 164,713 |  |  |  | 14.6 | % |  | $ | 45,122 |  |  |  | 4.00 | % |  | N/A |  |  | N/A |
NBB |  |  | 162,402 |  |  |  | 14.4 | % |  |  | 45,074 |  |  |  | 4.00 | % |  | $ | 56,342 |  |  |  | 5.00 | %
|  | Actual |  |  | Minimum Capital Requirement |  |  | Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions |
|  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |
December 31, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total capital (to risk weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
NBI consolidated |  | $ | 162,763 |  |  |  | 23.6 | % |  | $ | 55,192 |  |  |  | 8.00 | % |  | N/A |  |  | N/A |
NBB |  |  | 160,049 |  |  |  | 23.3 | % |  |  | 54,980 |  |  |  | 8.00 | % |  | $ | 68,726 |  |  |  | 10.00 | %
Tier 1 capital (to risk weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
NBI consolidated |  | $ | 154,536 |  |  |  | 22.4 | % |  | $ | 27,596 |  |  |  | 4.00 | % |  | N/A |  |  | N/A |
NBB |  |  | 151,822 |  |  |  | 22.1 | % |  |  | 27,490 |  |  |  | 4.00 | % |  | $ | 41,235 |  |  |  | 6.00 | %
Tier 1 capital (to average assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
NBI consolidated |  | $ | 154,536 |  |  |  | 14.1 | % |  | $ | 43,946 |  |  |  | 4.00 | % |  | N/A |  |  | N/A |
NBB |  |  | 151,822 |  |  |  | 13.8 | % |  |  | 43,904 |  |  |  | 4.00 | % |  | $ | 54,880 |  |  |  | 5.00 | %

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- Definition Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958570-112826 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1G -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958577-112826 + Details
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