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Loans Payable - Note 8 - Promissory Note - Additional Information (Detail)			3 Months Ended		12 Months Ended
	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%
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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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