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Loans Payable - Note 8 - Promissory Note - Additional Information (Detail) |  |  | 3 Months Ended | 12 Months Ended |  |  |  |  |  |
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Aug. 14, 2020 USD ($) Cuota $ / shares shares | Jul. 12, 2018 USD ($) Parties | Mar. 31, 2021 USD ($) $ / shares shares | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2020 USD ($) | Aug. 21, 2020 $ / shares shares | Jul. 08, 2019 $ / shares shares | Oct. 04, 2018 USD ($) | Aug. 17, 2018 USD ($) | Oct. 01, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  |  |  |  |  |  |  | $ 3,000,000
Warrants exercise price | $ / shares |  |  |  |  |  |  |  | $ 4.75 |  |  |  |
Gain (loss) on debt extinguishment |  |  |  |  | $ 290,024 |  |  |  |  |  |  |
Fair value reacquisition price |  |  | $ 1,340,024 |  |  |  |  |  |  |  |  |
Debt instrument unamortized premium | $ 358,497 |  | 290,024 |  |  |  | $ 195,862 |  |  |  |  |
Debt modification inducement |  |  | 868,878 |  |  |  |  |  |  |  |  |
Warrants exercise price | $ \ share | $ / shares |  |  |  |  |  |  |  | $ 4.75 |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares |  |  |  |  |  |  |  | 1,901,989 |  |  |  |
Debt Instrument, Unamortized Premium | $ 358,497 |  | 290,024 |  |  |  | 195,862 |  |  |  |  |
Amortization of debt discount premium |  |  | $ 95,683 | $ 71,606 |  |  |  |  |  |  |  |
Note And Warrant Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  | $ 1,050,000 |  |  |  |  |  |  |  |  |  |
Number of individuals purchase agreement entered into | Parties |  | 2 |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate |  | 8.00% |  |  |  |  |  |  |  |  |  |
Debt instrument conversion rate after sale of additional notes or date of closing |  |  | 8.00 |  |  |  |  |  |  |  |  |
Transfer of indebtedness after sale of additional notes or date of closing |  |  | $ 500,000 |  |  |  |  |  |  |  |  |
Warrants exercised to purchase common shares | shares |  |  | 65,625 |  |  |  |  |  |  |  |  |
Warrants exercise price | $ / shares | $ 4.67 |  | $ 12.00 |  |  |  |  |  | $ 5.756 |  |  |
Accrued interest |  |  | $ 25,234 | $ 23,555 |  |  |  |  |  |  |  |
Gain (loss) on debt extinguishment | $ 777,500 |  |  |  |  |  |  |  |  |  |  |
Warrants exercise price | $ \ share | $ / shares | $ 4.67 |  | $ 12.00 |  |  |  |  |  | $ 5.756 |  |  |
Warrant expire date | Aug. 14, 2023 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date | Jul. 12, 2021 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Price | $ / shares | $ 4.67 |  |  |  |  |  |  |  |  |  |  |
Aggregate amount of indebtedness outstanding | $ 1,232,846 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Number of Equity Instruments | Cuota | 263,993 |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares | 131,996 |  |  |  |  |  |  |  | 196,135 |  |  |
Beneficial Conversion Feature ("BCF") [Member] | Note And Warrant Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  | $ 1,050,000 |  |  |  | $ 1,050,000 |  |  |  |  |
Minimum [Member] | Note And Warrant Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Change in the fair value of the embedded conversion option |  |  |  |  |  |  |  |  | 10.00% |  |  |
Maximum [Member] | Note And Warrant Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Effects Of Modification On Cash Flow On Present Value Basis |  |  |  |  |  |  |  |  | 10.00% |  |  |
Maximum [Member] | Beneficial Conversion Feature ("BCF") [Member] | Note And Warrant Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative asset |  |  |  |  |  | $ 1,050,000 |  |  |  |  |  |
Aldama Mining Company, S.de R.L. de C.V [Member] | Note And Warrant Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in subsidiaries the note to be converted after sale of additional notes or date of closing |  |  | 7.50% |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption, Period One [Member] | Note And Warrant Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  | $ 500,000 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption, Period Two [Member] | Note And Warrant Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  |  |  |  |  |  | $ 300,000 |
Debt Instrument, Redemption, Period Three [Member] | Note And Warrant Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  |  |  |  |  | $ 250,000 |  |
Individual One [Member] | Minimum [Member] | Note And Warrant Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in company's common stock |  | 5.00% |  |  |  |  |  |  |  |  |  |

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