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Note 10 - Stockholders' Equity - Common Stock Dividends Declared by Our Board of Directors (Details) $ / shares in Units, $ in Millions | Dec. 31, 2020 USD ($) $ / shares
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Declared February 14, 2018 [Member] |
Minimum annual component per share (in dollars per share) | $ 0.0025
Total dividend per share (in dollars per share) | $ 0.0025
Total dividend amount (in Dollars) | $ | $ 1.0
Declared May 9,2018 [Member] |
Minimum annual component per share (in dollars per share) | $ 0.0025
Total dividend per share (in dollars per share) | $ 0.0025
Total dividend amount (in Dollars) | $ | $ 1.0
Declared August 8, 2018 [Member] |
Minimum annual component per share (in dollars per share) | $ 0.0025
Total dividend per share (in dollars per share) | $ 0.0025
Total dividend amount (in Dollars) | $ | $ 1.2
Declared November 6, 2018 [Member] |
Minimum annual component per share (in dollars per share) | $ 0.0025
Total dividend per share (in dollars per share) | $ 0.0025
Total dividend amount (in Dollars) | $ | $ 1.2
Declared February 20, 2019 [Member] |
Minimum annual component per share (in dollars per share) | $ 0.0025
Total dividend per share (in dollars per share) | $ 0.0025
Total dividend amount (in Dollars) | $ | $ 1.2
Declared May 7, 2019 [Member] |
Minimum annual component per share (in dollars per share) | $ 0.0025
Total dividend per share (in dollars per share) | $ 0.0025
Total dividend amount (in Dollars) | $ | $ 1.2
Declared August 5, 2019 [Member] |
Minimum annual component per share (in dollars per share) | $ 0.0025
Total dividend per share (in dollars per share) | $ 0.0025
Total dividend amount (in Dollars) | $ | $ 1.2
Declared November 6, 2019 [Member] |
Minimum annual component per share (in dollars per share) | $ 0.0025
Total dividend per share (in dollars per share) | $ 0.0025
Total dividend amount (in Dollars) | $ | $ 1.3
Declared February 21, 2020 [Member] |
Minimum annual component per share (in dollars per share) | $ 0.0025
Total dividend per share (in dollars per share) | $ 0.0025
Total dividend amount (in Dollars) | $ | $ 1.3
Declared May 6, 2020 [Member] |
Minimum annual component per share (in dollars per share) | $ 0.0025
Total dividend per share (in dollars per share) | $ 0.0025
Total dividend amount (in Dollars) | $ | $ 1.3
Declared August 5, 2020 [Member] |
Minimum annual component per share (in dollars per share) | $ 0.0025
Total dividend per share (in dollars per share) | $ 0.0025
Total dividend amount (in Dollars) | $ | $ 1.3
Declared November 6, 2020 [Member] |
Minimum annual component per share (in dollars per share) | $ 0.00375
Total dividend per share (in dollars per share) | $ 0.00875
Total dividend amount (in Dollars) | $ | $ 4.6
Silver-price-linked component per share (in dollars per share) | $ 0.005

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- Definition Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding. + 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(24)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: 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(15)(5)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: 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(20)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: 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)(15)(5)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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