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Note 12 - Equity-based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2021
Notes Tables |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Restricted Stock |  | $ | 4,656 |  |  | $ | 3,072 |  |  | $ | 12,629 |  |  | $ | 8,257 |
SARs |  |  | 772 |  |  |  | 795 |  |  |  | 2,205 |  |  |  | 2,257 |
Total |  | $ | 5,428 |  |  | $ | 3,867 |  |  | $ | 14,834 |  |  | $ | 10,514 |
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] |
|  |  |  |  |  | Weighted |
|  |  |  |  |  | Average Grant |
|  | Restricted |  |  | Date Fair Value |
|  | Stock |  |  | Per Share |
Outstanding as of December 31, 2020 |  |  | 34,944 |  |  | $ | 1,037.83 |
Granted |  |  | 11,983 |  |  | $ | 2,157.55 |
Forfeited |  |  | (1,328 | ) |  | $ | 1,404.28 |
Vested and issued |  |  | (11,241 | ) |  | $ | 866.89 |
Outstanding as of September 30, 2021 |  |  | 34,358 |  |  | $ | 1,470.12 |
Vested and deferred as of September 30, 2021 |  |  | 5,978 |  |  | $ | 756.32 |
Share-based Payment Arrangement, Stock Appreciation Right, Activity [Table Text Block] |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Weighted |
|  |  |  |  |  |  |  |  |  | Weighted |  |  |  |  |  |  | Average |
|  |  |  |  |  | Weighted |  |  | Average |  |  | Aggregate |  |  | Remaining |
|  | Stock |  |  | Average |  |  | Grant |  |  | Intrinsic |  |  | Contractual |
|  | Appreciation |  |  | Exercise |  |  | Date Fair |  |  | Value |  |  | Term |
|  | Rights |  |  | Price |  |  | Value |  |  | (in thousands) |  |  | (in years) |
Outstanding as of December 31, 2020 |  |  | 58,365 |  |  | $ | 866.54 |  |  | $ | 204.29 |  |  | $ | 79,446 |  |  |  | 7.3 |
Granted |  |  | 3,500 |  |  | $ | 2,041.73 |  |  | $ | 548.01 |  |  | $ | - |  |  |  | 9.5 |
Exercised |  |  | (13,779 | ) |  | $ | 597.19 |  |  | $ | 133.96 |  |  | $ | 18,948 |  |  |  | - |
Forfeited |  |  | (1,601 | ) |  | $ | 834.92 |  |  | $ | 201.50 |  |  |  |  |  |  |  |  |
Outstanding as of September 30, 2021 |  |  | 46,485 |  |  | $ | 1,035.95 |  |  | $ | 251.11 |  |  | $ | 37,042 |  |  |  | 7.2 |
Exercisable as of September 30, 2021 |  |  | 20,673 |  |  | $ | 748.02 |  |  | $ | 174.45 |  |  | $ | 22,019 |  |  |  | 6.3 |
Schedule of Share-based Payment Award, Other than Options, Valuation Assumptions [Table Text Block] |
|  | Inputs |
Expected volatility |  |  | 27.47 | %
Risk-free interest rate |  |  | 0.86 | %
Expected term (in years) |  |  | 6.25 |
Expected dividend yield |  |  | 0.49 | %

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of awards excluding options (for example, stock appreciation rights, restricted stock, phantom stock), including, but not limited to: (a) expected term of awards, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References No definition available. + Details
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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock appreciation rights awards that were outstanding at the beginning and end of the year, and the number of stock appreciation rights awards that were granted, exercised or converted, forfeited, and expired during the year. + 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)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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