Note 13 - Subsequent Events (Details) - Subsequent Events	Jul. 10, 2022 employee	Jul. 14, 2022 $ / shares
Subsequent Events
Number of personnel in the mine \| employee	0
Dividend payable per share \| $ / shares		$ 0.1134

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=126999549&loc=d3e4304-108586

Name:	us-gaap_DividendsPayableAmountPerShare
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant