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Note 6 - Employee Benefit Plans (Details) (USD $) | 3 Months Ended | 9 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jun. 28, 2014 | Jun. 28, 2014 | Jun. 28, 2014 Supplemental Employee Retirement Plan [Member] | Jun. 28, 2014 Reduced SERP [Member] | Jun. 28, 2014 Minimum [Member] Supplemental Employee Retirement Plan [Member] | Mar. 29, 2014 Minimum [Member] Reduced SERP [Member]
Note 6 - Employee Benefit Plans (Details) [Line Items] |  |  |  |  |  |
Pension Contributions (in Dollars) | $ 87,000 | $ 188,000 |  |  |  |
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year (in Dollars) | $ 52,000 |  |  |  |  |
Defined Benefit Plan, Employment Term |  |  |  |  | 30 years | 10 years
Supplemental Retirement Benefit Period |  |  | 15 years |  |  |
Defined Benefit Plan, Percent of Highest Average Salary Base |  |  | 50.00% |  |  |
Defined Benefit Plan, Number of Years in Average Annual Base Salary |  |  | 5 years |  |  |
Defined Benefit Plan, Number of Years Preceding Retirement for Average Annual Base Salary Calculation |  |  | 10 years |  |  |
Defined Benefit Plan, Retirement Age |  |  |  | 65 years |  |

X
- Definition The amount of time that a Participant must remain in continuous service with the Company to be eligible for supplemental retirement benefits. + References No definition available. + Details
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Balance Type: | na
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X
- Definition The number of consecutive years used to determine a Participants highest base salary in a supplemental employee retirement plan. + References No definition available. + Details
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Namespace Prefix: | iiin_
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X
- Definition The period preceding a participants retirement which is used as a time frame to determine which 5 consecutive years will be used to determine highest average salary. + References No definition available. + Details
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- Definition The percentage of a Participants highest average base salary that will be matched and payed out to the Participant as supplemental retirement benefits if they meet the continuous service requirement. + References No definition available. + Details
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- Definition The minimum age that an employee may retire at to receive full benefits. + References No definition available. + Details
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Data Type: | xbrli:durationItemType
Balance Type: | na
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- Details
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Data Type: | xbrli:stringItemType
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- Definition The period of time that a Participant will be payed supplemental retirement benefits if they meet the continuous service requirement. + References No definition available. + Details
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Data Type: | xbrli:durationItemType
Balance Type: | na
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X
- Definition Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period. + References No definition available. + Details
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- Definition The amount of cash or cash equivalents contributed by the entity to fund its pension plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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