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Commitments and Contingencies - Life Insurance and Controll Agreements (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Maximum |  |
Commitment and contingencies |  |
Professional outplacement services that would be received by the participants | $ 10,000 |
2002 Plan |  |
Commitment and contingencies |  |
Period of graded vesting schedule | 5 years |
Annual vesting by the participants (as a percent) | 20.00% |
Expenses incurred | $ 327,000 | $ 207,000
2002 Plan | Officer participants |  |
Commitment and contingencies |  |
Bonus to be paid as a percentage of the participants base annual salary | 15.00% |
2002 Plan | Other participants |  |
Commitment and contingencies |  |
Bonus to be paid as a percentage of the participants base annual salary | 10.00% |
Agreement(s) | Officer participants |  |
Commitment and contingencies |  |
Period of continued participation in health, disability and life insurance plans after involuntary termination | 3 years |
Agreement(s) | Other participants |  |
Commitment and contingencies |  |
Period of continued participation in health, disability and life insurance plans after involuntary termination | 2 years |

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- Definition Represents the annual vesting percentage of participants under the plan of the entity. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Represents the amount of bonus to be paid as a percentage of the participants' base annual salary. + References No definition available. + Details
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Namespace Prefix: | nsys_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Represents the period of continued participation in health, disability and life insurance plans for the participants in the event of an involuntarily termination. + References No definition available. + Details
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- Definition Represents the period of graded vesting schedule in which the participants vest under the plan of the entity. + References No definition available. + Details
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- Definition Represents the amount of professional outplacement services that would be received by the participants in the event of an involuntarily termination. + References No definition available. + Details
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Namespace Prefix: | nsys_
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Balance Type: | credit
Period Type: | duration

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- Definition Amount of labor-related expenses classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Details
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Namespace Prefix: |
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- Details
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- Details
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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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