Note 5 - Leases - Future Minimum Payments (Details) $ in Thousands	Dec. 31, 2021 USD ($)
2022	$ 675
2023	494
2024	405
2025	367
2026	378
Thereafter	31
Total	$ 2,350

Represents the total lessee, liability payments.

No definition available.

Name:	whlm_LesseeLiabilityPaymentsDue
Namespace Prefix:	whlm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents the lessee, liability payments due after year five.

No definition available.

Name:	whlm_LesseeLiabilityPaymentsDueAfterYearFive
Namespace Prefix:	whlm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents the lessee, liability payments due next twelve months.

No definition available.

Name:	whlm_LesseeLiabilityPaymentsDueNextTwelveMonths
Namespace Prefix:	whlm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents the lessee, liability payments due in the fifth year.

No definition available.

Name:	whlm_LesseeLiabilityPaymentsDueYearFive
Namespace Prefix:	whlm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents the lessee, liability payments due in the fourth year.

No definition available.

Name:	whlm_LesseeLiabilityPaymentsDueYearFour
Namespace Prefix:	whlm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents the lessee, liability payments due in the third year.

No definition available.

Name:	whlm_LesseeLiabilityPaymentsDueYearThree
Namespace Prefix:	whlm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents the lessee, liability payments due in the second year.

No definition available.

Name:	whlm_LesseeLiabilityPaymentsDueYearTwo
Namespace Prefix:	whlm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant