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Note 9 - Post-retirement Benefits (Details Textual) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
--- | --- | ---
Retirement Plan Minimum Age | 65 |
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 | $ 59,000 | $ 125,000

X
- Definition The accrued amount of lump sums paid to employees as part of the company's post-retirement benefit plan. + References No definition available. + Details
Name: | ins_RetirementPlanLumpSumCashPaymentAccrual
Namespace Prefix: | ins_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The maximum amount an employee can receive as part of the company's post-retirement benefit plan. + References No definition available. + Details
Name: | ins_RetirementPlanLumpSumCashPaymentMaximum
Namespace Prefix: | ins_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount contributed to an employee's post-retirement lump sum receipt for every year of the employee's service with the company. + References No definition available. + Details
Name: | ins_RetirementPlanLumpSumCashPaymentPerYear
Namespace Prefix: | ins_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The minimum age for which an employee can enter into the company's retirement plan. + References No definition available. + Details
Name: | ins_RetirementPlanMinimumAge
Namespace Prefix: | ins_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant