| Document And Entity Information | Aug. 10, 2021 |
| Document Information [Line Items] | |
| Entity, Registrant Name | Giga-tronics Incorporated |
| Document, Type | 8-K |
| Document, Period End Date | Aug. 10, 2021 |
| Entity, Incorporation, State or Country Code | CA |
| Entity, File Number | 0-12719 |
| Entity, Tax Identification Number | 94-2656341 |
| Entity, Address, Address Line One | 5990 Gleason Drive |
| Entity, Address, City or Town | Dublin |
| Entity, Address, State or Province | CA |
| Entity, Address, Postal Zip Code | 94568 |
| City Area Code | 925 |
| Local Phone Number | 328-4650 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock |
| Trading Symbol | GIGA |
| Entity, Emerging Growth Company | false |
| Amendment Flag | false |
| Entity, Central Index Key | 0000719274 |
