| Cover | Sep. 13, 2021 |
| Affiliate, Collateralized Security [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Sep. 13, 2021 |
| Entity File Number | 001-38015 |
| Entity Registrant Name | SIGMA LABS, INC. |
| Entity Central Index Key | 0000788611 |
| Entity Tax Identification Number | 27-1865814 |
| Entity Incorporation, State or Country Code | NV |
| Entity Address, Address Line One | 3900 Paseo del Sol |
| Entity Address, City or Town | Santa Fe |
| Entity Address, State or Province | NM |
| Entity Address, Postal Zip Code | 87507 |
| City Area Code | (505) |
| Local Phone Number | 438-2576 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Common Stock, par value $0.001 per share | |
| Affiliate, Collateralized Security [Line Items] | |
| Title of 12(b) Security | Common Stock, par value $0.001 per share |
| Trading Symbol | SGLB |
| Security Exchange Name | NASDAQ |
| Warrants to Purchase Common Stock, | |
| Affiliate, Collateralized Security [Line Items] | |
| Title of 12(b) Security | Warrants to Purchase Common Stock, par value $0.001 per share |
| Trading Symbol | SGLBW |
| Security Exchange Name | NASDAQ |
