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v3.21.1

Subsequent Events (Details Narrative) - shares | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Stock options granted |  | 172,000 | 347,000
Employee [Member] |  |  |
Stock options granted | 32,000 |  |
Consultants [Member] |  |  |
Stock options granted | 20,000 | 45,000 | 95,000

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

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