XML 47 R33.htm IDEA: XBRL DOCUMENT
v3.23.1

Note 9 - Stock Transactions and Stock-based Compensation (Tables) | 12 Months Ended
--- | ---
Mar. 31, 2023
Notes Tables |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Year Ended March 31, |
|  | 2023 |  |  | 2022 |  |  | 2021 |
Stock-based compensation expense |  | $ | 12,538 |  |  | $ | 11,391 |  |  | $ | 9,268 |
Amount of income tax (benefit) recognized in earnings |  |  | (1,169 | ) |  |  | (4,055 | ) |  |  | (1,816 | )
Stock-based compensation expense, net of tax |  | $ | 11,369 |  |  | $ | 7,336 |  |  | $ | 7,452 |
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 2023 |  |  | 2022 |  |  | 2021 |
Risk-free interest rate |  |  | 3.55 | % |  |  | 0.46 | % |  |  | 0.27 | %
Expected life (years) |  |  | 3.52 |  |  |  | 3.52 |  |  |  | 3.86 |
Expected dividend yield |  |  | 0.07 | % |  |  | 0.06 | % |  |  | 0.10 | %
Volatility |  |  | 37.29 | % |  |  | 38.82 | % |  |  | 38.83 | %
Weighted-average Black-Scholes fair value per share at date of grant |  | $ | 58.94 |  |  | $ | 76.02 |  |  | $ | 67.66 |
Share-Based Payment Arrangement, Option, Activity [Table Text Block] |
|  | Stock Options |
|  | Shares Subject to Options |  |  | Weighted- Average Exercise Price per Share |  |  | Weighted-Average Remaining Contractual Life (Years) |  |  | Aggregate Intrinsic Value |
Outstanding as of March 31, 2022 |  |  | 202 |  |  | $ | 167.14 |  |  |  | 2.9 |  |  | $ | 18,261 |
Awards granted |  |  | 43 |  |  |  | 185.60 |  |  |  |  |  |  |  |  |
Awards forfeited or expired |  |  | (9 | ) |  |  | 218.13 |  |  |  |  |  |  |  |  |
Awards exercised or distributed |  |  | (73 | ) |  |  | 97.34 |  |  |  |  |  |  |  |  |
Outstanding as of March 31, 2023 |  |  | 163 |  |  | $ | 200.62 |  |  |  | 3.3 |  |  | $ | 1,643 |
Exercisable as of March, 31, 2023 |  |  | 83 |  |  | $ | 193.05 |  |  |  | 2.3 |  |  | $ | 1,405 |
Exercisable and expected to vest, March 31, 2023 |  |  | 160 |  |  | $ | 200.62 |  |  |  | 3.2 |  |  | $ | 1,641 |
Share-Based Payment Arrangement, Activity [Table Text Block] |
|  | Time-Based Restricted Stock Units |
|  | Number of Shares |  |  | Weighted- Average Grant Date Fair Value per Share |  |  | Weighted- Average Remaining Contractual Life (Years) |  |  | Aggregate Intrinsic Value |
Nonvested at March 31, 2022 |  |  | 51 |  |  | $ | 252.86 |  |  |  | 1.0 |  |  | $ | 13,019 |
Awards granted |  |  | 43 |  |  |  | 187.21 |  |  |  |  |  |  |  |  |
Awards forfeited or expired |  |  | (10 | ) |  |  | 229.52 |  |  |  |  |  |  |  |  |
Awards distributed |  |  | (27 | ) |  |  | 250.85 |  |  |  |  |  |  |  |  |
Nonvested as of March 31, 2023 |  |  | 57 |  |  | $ | 209.27 |  |  |  | 1.0 |  |  | $ | 9,993 |
Expected to vest |  |  | 53 |  |  | $ | 209.43 |  |  |  | 1.8 |  |  | $ | 9,254 |
Share-Based Payment Arrangement, Performance Shares, Activity [Table Text Block] |
|  | Performance-Based Restricted Stock Units |
|  | Number of Shares |  |  | Weighted- Average Grant Date Fair Value per Share |  |  | Weighted- average Remaining Contractual Life (Years) |  |  | Aggregate Intrinsic Value |
Nonvested at March 31, 2022 at target |  |  | 55 |  |  | $ | 288.45 |  |  |  | 4.3 |  |  | $ | 14,093 |
Awards granted |  |  | 19 |  |  |  | 182.14 |  |  |  |  |  |  |  |  |
Performance adjustment |  |  | (20 | ) |  |  |  |  |  |  |  |  |  |  |  |
Awards distributed |  |  | (10 | ) |  |  | 202.00 |  |  |  |  |  |  |  |  |
Nonvested as of March 31, 2023 at target |  |  | 44 |  |  | $ | 286.02 |  |  |  | 3.5 |  |  | $ | 7,958 |
Expected to vest |  |  | 42 |  |  | $ | 287.48 |  |  |  | 3.4 |  |  |  | 7,306 |

X
- 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 -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- 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 -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- 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 -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of number and weighted-average grant date fair value for nonvested performance shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Subparagraph (c) -Paragraph 2 -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ShareBasedCompensationPerformanceSharesAwardUnvestedActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_TableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration