Note 1 - Basis of Preparation of Financial Statements (Details Textual) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended
	Sep. 07, 2022	Sep. 30, 2022	Sep. 30, 2022	Sep. 30, 2021
COVID-19 Mitigation Costs			$ 400	$ 3,100
Transaction costs	$ 5,100
Stock issued during period shares to settle the acquired silver stream		34,800,990	34,800,990
Other comprehensive loss increase adjustments income tax		$ 12,649
Increase accumulated comprehensive loss		$ 12,649
Alexco Asset Acquisition [Member]
Noncash or part noncash acquisition, Interest acquired	90.10%
Noncash or part noncash acquisition, Noncash financial or equity instrument consideration, Shares issued	17,992,875
Asset acquisition, Consideration transferred, Equity interest issued and issuable	$ 68,700
Asset acquisition, Consideration transferred	$ 81,500
Asset acquisition, Step acquisition, Investment held in acquiree prior to acquisition, Percentage	9.90%
Asset acquisition, Recognized identifiable assets acquired and liabilities assumed, Deferred tax liabilities	$ 12,900
Asset acquisition, Recognized identifiable assets acquired and liabilities assumed, Silver stream liability	$ 135,000
Stock issued during period shares to settle the acquired silver stream	34,800,990
Marketable Securities	$ 7,700
Asset acquisition, recognized identifiable assets acquired and liabilities assumed, net liabilities	7,200
Alexco Asset Acquisition [Member] | Common Stock [Member]
Asset acquisition, Consideration transferred, Total non cash consideration	76,400
Alexco Asset Acquisition [Member] | Mineral Interests [Member]
Asset acquisition, Recognized identifiable assets acquired and liabilities assumed, Mineral interests	$ 236,600