Liquidity (Details) - USD ($) shares in Millions	1 Months Ended	3 Months Ended		9 Months Ended	12 Months Ended
	Apr. 30, 2020	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2020	Mar. 31, 2021	Dec. 31, 2019	Dec. 31, 2018
Cash and cash equivalents		$ 2,212,000	$ 2,237,000			$ 4,593,000	$ 3,293,000
Other exploration and property holding costs		4,400,000
Exploration expenditures		1,631,000	855,000
Shutdown and care and maintenance costs		463,000	517,000
General and administrative expenses		1,163,000	1,074,000
Increase in cash inflows		2,000,000
Increase in working capital		200,000
Debt - related party		1,000,000
Net proceeds from the sale of the Company’s common stock		439,000	337,000
Remaining deposits payable		740,000				1,251,000
Income tax payments due						292,000
Project expenditures		9,000,000
Cash		8,000,000
Payments to acquire property		$ 1,000	$ 25,000
Stock Issued During Period, Shares, Private Placement		4.7
Private placements stock units, net		$ 2,800,000
Canada Revenue Agency [Member]
Income tax payments due						300,000
Mexican Tax Authority [Member]
Income tax payments due						$ 400,000
Forecast
Project expenditures					$ 9,000,000
Forecast | Canada
Income tax payments due					500,000
Velardena properties
Shutdown and care and maintenance costs		500,000
Oxide Plant
Net operating margin		600,000
El Quevar Project
Other exploration and property holding costs		200,000
LPC Program [Member]
Other exploration and property holding costs		400,000
LPC Program [Member] | Forecast
General and administrative expenses					3,100,000
Santa Maria property
Sale of an investment	$ 900,000
Santa Maria property | Forecast
Net operating margin				$ 2,100,000
Yoquivo and other properties | Forecast
Other exploration and property holding costs					2,200,000
Sand Canyon [Member]
Exploration expenditures		1,600,000
ATM Agreement
Net proceeds from the sale of the Company’s common stock		$ 223,000
Common Stock Available For Future Issuance		8.1
LPC Program [Member]
Net proceeds from the sale of the Company’s common stock		$ 216,000
Common Stock Available For Future Issuance		12.2
Electrum | Velardena properties | Forecast
Shutdown and care and maintenance costs					1,500,000
Autlan | Agreement | Forecast
Payments to acquire property					$ 700,000