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Note 12 - Subsequent Events (Details Textual) - USD ($) $ / shares in Units, $ in Millions | Jul. 21, 2022 | Jul. 19, 2022 | Jul. 05, 2022 | Jul. 31, 2018
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Revolving Credit Facility [Member] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 250
Revolving Credit Facility [Member] | New Credit Agreement [Member] | Base Rate [Member] | Maximum [Member] | Forecast [Member] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate, Applicable Margin | 2.50% |  |  |
Revolving Credit Facility [Member] | New Credit Agreement [Member] | Base Rate [Member] | Minimum [Member] | Forecast [Member] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate, Applicable Margin | 1.00% |  |  |
Subsequent Event [Member] | Revolving Credit Facility [Member] | New Credit Agreement [Member] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 150 |  |  |
Line of Credit Facility, Maximum Borrowing Capacity, Option | $ 75 |  |  |
Subsequent Event [Member] | Revolving Credit Facility [Member] | New Credit Agreement [Member] | Maximum [Member] |  |  |  |
Line of Credit Facility, Commitment Fee Percentage | 0.7875% |  |  |
Subsequent Event [Member] | Revolving Credit Facility [Member] | New Credit Agreement [Member] | Minimum [Member] |  |  |  |
Line of Credit Facility, Commitment Fee Percentage | 0.45% |  |  |
Subsequent Event [Member] | Revolving Credit Facility [Member] | New Credit Agreement [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.00% |  |  |
Debt Instrument, Basis Spread on Variable Rate, Applicable Margin | 2.25% |  |  |
Subsequent Event [Member] | Revolving Credit Facility [Member] | New Credit Agreement [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] | Maximum [Member] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 0.10% |  |  |
Subsequent Event [Member] | Revolving Credit Facility [Member] | New Credit Agreement [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] | Minimum [Member] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 3.00% |  |  |
Subsequent Event [Member] | Revolving Credit Facility [Member] | New Credit Agreement [Member] | Three Month SOFR [Member] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 0.15% |  |  |
Subsequent Event [Member] | Revolving Credit Facility [Member] | New Credit Agreement [Member] | Fed Funds Effective Rate Overnight Index Swap Rate [Member] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 0.50% |  |  |
Subsequent Event [Member] | Revolving Credit Facility [Member] | New Credit Agreement [Member] | Base Rate [Member] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate, Applicable Margin | 1.25% |  |  |
Subsequent Event [Member] | Revolving Credit Facility [Member] | New Credit Agreement [Member] | Leverage Ratio Applicable Margin [Member] | Maximum [Member] |  |  |  |
Debt Instrument, Participation Fee, Percent | 3.50% |  |  |
Subsequent Event [Member] | Revolving Credit Facility [Member] | New Credit Agreement [Member] | Leverage Ratio Applicable Margin [Member] | Minimum [Member] |  |  |  |
Debt Instrument, Participation Fee, Percent | 2.00% |  |  |
Subsequent Event [Member] | Wheaton Precious Metals Corporation [Member] |  |  |  |
Common Stock Exchanged for Termination Agreement, Value |  |  | $ 135 |
Subsequent Event [Member] | Alexco [Member] |  |  |  |
Business Acquisition, Shares Exchanged Per Acquired Share Received (in shares) |  |  | 0.116 |
Business Acquisition, Share Price (in dollars per share) |  |  | $ 0.47 |
Business Acquisiton, Subscription Advanced |  | $ 20 |  |
Business Acquisition, Ownership Percentage After Subscribing for Additional Shares |  |  | 9.90% |

X
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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