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Note 10 - Post-retirement Benefits (Details Textual)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
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		$ 50,000

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