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v3.22.1

SUBSEQUENT EVENTS (Details Narrative) - shares | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 29, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Subsequent Event [Line Items] |  |  |
Stock options granted |  | 170,000 | 172,000
Employee [Member] | Subsequent Event [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Stock options granted | 5,000 |  |
Employee [Member] | Subsequent Event [Member] | Upon Exercise of Stock Options [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Stock options granted | 20,500 |  |

X
- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_TitleOfIndividualAxis=FSI_EmployeeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=FSI_UponExerciseofStockOptionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |