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Note 21 - Incentive Plans - Performance Shares Activity (Details) - Performance Shares [Member] - shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Restricted stock outstanding as of January 1, (in shares) |  | 704,530 | 433,230 | 235,950
Granted (1) (in shares) | [1] | 506,720 | 407,080 | 297,450
Vested (in shares) | [2] | (297,450) | (135,780) | (100,170)
Restricted stock outstanding as of December 31, (in shares) |  | 913,800 | 704,530 | 433,230
[1] | The weighted-average grant date fair value for performance shares issued during the years ended December 31, 2020, 2019 and 2018 were $18.02, $22.00 and $15.40, respectively.
[2] | For the years ended December 31, 2020, 2019 and 2018, the corresponding common stock equivalent of these vested awards were 594,900, 104,551 and 0 shares, respectively.

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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