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Loans Payable - Note 8 - Promissory Note - Additional Information (Detail)			12 Months Ended
	Aug. 14, 2020 USD ($) Cuota $ / shares shares	Jul. 12, 2018 USD ($) Parties	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	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
Common Shares Issuable Pursuant To Exercise Of Warrants | shares						1,901,989
Gain (loss) on debt extinguishment			$ 777,484	$ 290,024
Fair value reacquisition price			1,340,024
Debt instrument unamortized premium	$ 358,497		290,024
Debt modification inducement			868,878	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
Amortization of debt discount premium			$ 323,171	129,487
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			50,000
Warrants exercise price | $ / shares	$ 4.67		$ 12.00				$ 5.756
Accrued interest			$ 97,652	89,911
Common Shares Issuable Pursuant To Exercise Of Warrants | shares	131,996						196,135
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]
Debt Instrument [Line Items]
Debt Instrument, Convertible, Conversion Price | $ / shares			$ 3.71
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]
Debt Instrument [Line Items]
Debt Instrument, Convertible, Conversion Price | $ / shares			$ 5.00
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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