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Note 8 - Stockholders' Equity | 3 Months Ended
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Jun. 30, 2020
Notes to Financial Statements |
Stockholders' Equity Note Disclosure [Text Block] | Note 8. Stockholders' Equity Public Offerings of Common Stock On June 12, 2020, we completed the sale and issuance of 600,000 shares of our common stock and on June 19, 2020, our underwriters exercised in full their option to purchase an additional 90,000 shares of our common stock. The offering price to the public was $225.00 per share. The total proceeds we received from the offering, net of underwriting discounts and commissions and other offering expenses that we initially paid was $145,935. Stock-Based Compensation Amounts recognized related to stock-based compensation are as follows:
|  | Three Months Ended June 30, |
|  | 2020 |  |  | 2019 |
Stock-based compensation expense |  | $ | 1,268 |  |  | $ | 868 |
Amount of income tax (benefit) recognized in earnings |  |  | (925 | ) |  |  | (540 | )
Stock-based compensation expense, net of tax |  | $ | 343 |  |  | $ | 328 |
Stock-based compensation expense is included in cost of revenues, selling, general and administrative, and research and development expense in the accompanying unaudited Condensed Consolidated Statements of Income. The following is a summary of stock option award activity for the three months ended June 30, 2020 (shares in thousands):
|  | Stock Options |
|  | Shares Subject to Options |  |  | Weighted- Average Exercise Price per Share |
Outstanding at March 31, 2020 |  |  | 286 |  |  | $ | 107.72 |
Awards granted |  |  | 36 |  |  |  | 226.72 |
Awards forfeited or expired |  |  | (10 | ) |  |  | 112.93 |
Awards exercised |  |  | (23 | ) |  |  | 78.31 |
Outstanding as of June 30, 2020 |  |  | 289 |  |  | $ | 124.74 |
The stock options granted during the three months ended June 30, 2020 vest in equal installments on each of the first three anniversaries of the grant date. The following is a summary of restricted stock unit ("RSU") award activity for the three months ended June 30, 2020 (shares in thousands):
|  | Time-Based Restricted Stock Units |  |  | Performance-Based Restricted Stock Units |
|  | Number of Shares |  |  | Weighted- Average Grant Date Fair Value per Share |  |  | Number of Shares |  |  | Weighted- Average Grant Date Fair Value per Share |
Nonvested at March 31, 2020 |  |  | 28 |  |  | $ | 180.15 |  |  |  | 22 |  |  | $ | 204.68 |
Awards granted |  |  | 19 |  |  |  | 225.28 |  |  |  | - |  |  |  | - |
Awards forfeited or expired |  |  | (1 | ) |  |  | 191.65 |  |  |  | (1 | ) |  |  | 199.50 |
Awards distributed |  |  | (4 | ) |  |  | 180.59 |  |  |  | - |  |  |  | - |
Nonvested as of June 30, 2020 |  |  | 42 |  |  | $ | 200.68 |  |  |  | 21 |  |  | $ | 204.80 |
The majority of the time-based RSUs granted during the three months ended June 30, 2020 vest and settle in shares of our common stock, on a one-for-one basis, in equal installments on each of the first three anniversaries of the grant date. Time-based RSUs issued to non-employee directors vest after a one-year period from the grant date. We recognize the expense relating to these units, net of estimated forfeitures, on a straight-line basis over the vesting period. Performance-based RSUs vest upon completion of the service period described in the award agreement and based on achievements of the financial targets described in the award agreements. We recognize the expense relating to the performance-based RSUs based on the probable outcome of achievement of the financial targets, on a straight-line basis over the service period.

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(e)(1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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