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Note 9 - Fair Value Measurement (Details Textual) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2022 USD ($) | Mar. 31, 2021 USD ($)
Payments to Acquire Equity Securities, FV-NI | $ 10,868 | $ (0)
Proceeds from Sale of Equity Securities, FV-NI | 2,487 | 0
Senior Notes [Member] |  |
Notes Payable, Total | 469,700 |
Senior Notes [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Notes Payable, Fair Value Disclosure | 498,500 |
Senior Notes [Member] | IQ Notes [Member] |  |
Notes Payable, Total | 39,200 |
Senior Notes [Member] | IQ Notes [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Notes Payable, Fair Value Disclosure | $ 40,500 |
Senior Notes [Member] | IQ Notes [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input, Annual Yield [Member] |  |
Debt Instrument, Measurement Input | 6 |
Equity Securities in Mining Companies [Member] |  |
Payments to Acquire Equity Securities, FV-NI | $ 10,900 | 0
Equity Securities, FV-NI, Cost | 2,400 |
Proceeds from Sale of Equity Securities, FV-NI | $ 2,500 | $ 0

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- Definition Value of input used to measure debt instrument, including, but not limited to, convertible and non-convertible debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Definition Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 Reference 2: 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(22)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 45 -Paragraph 1 -URI https://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 https://asc.fasb.org/extlink&oid=126954810&loc=d3e3444-108585 + Details
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