Note 16 - Subsequent Events (Details Textual) - Canadian Junior Exploration Mining Company [Member] $ in Thousands, shares in Millions	Feb. 15, 2021 USD ($) shares
Investment, Number of Shares Acquired (in shares) \| shares	2.5
Payments to Acquire Equity Securities, FV-NI \| $	$ 5,250

Amount of cash outflow to acquire investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as investing activity.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=123583714&loc=SL75117360-209713

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 19
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3444-108585

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration