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Note 9 - Post-Retirement Benefits (Detail) (USD $) | Dec. 31, 2012
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Retirement Plan, Minimum Age | 65 years
Retirement Plan, Lump Sum Cash Payment, Per Year | $ 5,000
Retirement Plan, Lump Sum Cash Payment, Maximum | 50,000
Retirement Plan, Lump Sum Cash Payment, Accrual | $ 150,000

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- Definition No authoritative reference available. + References No definition available. + Details
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Namespace Prefix: | ins_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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