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Note 15 - Stock-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Share-based Payment Arrangement, Option, Activity [Table Text Block] |
|  |  |  |  |  | Weighted average |  |
|  |  |  | Weighted |  | remaining |  |
|  | Number of |  | average |  | contractual life |  | Aggregate
|  | options |  | exercise price |  | (years) |  | intrinsic value
Shares issuable under options - Beginning of period |  |  | 1,639,100 |  |  | $ | 60.26 |  |  |  |  |  |  |  |  |
Granted |  |  | 542,000 |  |  |  | 114.90 |  |  |  |  |  |  |  |  |
Exercised |  |  | (294,238 | ) |  |  | 40.34 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (3,750 | ) |  |  | 54.88 |  |  |  |  |  |  |  |  |
Shares issuable under options - December 31, 2020 |  |  | 1,883,112 |  |  | $ | 79.11 |  |  |  | 2.6 |  |  | $ | 108,772 |
Options exercisable - End of period |  |  | 714,014 |  |  | $ | 60.63 |  |  |  | 1.6 |  |  | $ | 54,383 |
Stock Options Exercised [Table Text Block] |
|  | 2020
Number of options exercised |  |  | 294,238 |
Aggregate fair value |  | $ | 33,734 |
Intrinsic value |  |  | 22,224 |
Amount of cash received |  |  | 11,510 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 2020
Risk free rate |  |  | 1.3 | %
Expected life in years |  |  | 4.75 |
Expected volatility |  |  | 30.5 | %
Dividend yield |  |  | 0.5 | %
Weighted average fair value per option granted |  | $ | 29.56 |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -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 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: 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 Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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