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Note 7 - EMPLOYEE BENEFIT PLANS (Tables) | 6 Months Ended
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Jun. 30, 2022
Notes Tables |
Schedule of Share-based Payment Awards, Stock Options, Valuation Assumptions |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2021 Purchase Plan | ​ | ​ | 2010 Purchase Plan | ​
​ | ​ | Six Months Ended June 30, |  | ​ | Six Months Ended June 30, |
​ | ​ | 2022 | ​ | ​ | 2021 | ​
Expected life (in years) | ​ | ​ | 1.25 |  | ​ | ​ | 1.25 | ​
Volatility | ​ | ​ | 48.90 | % | ​ | ​ | 34.25 | %
Risk-free interest rate | ​ | ​ | 0.86 | % | ​ | ​ | 1.43 | %
Expected dividend | ​ | ​ | — |  | ​ | ​ | — | ​
Weighted average fair value of purchase rights granted during the period | ​ | $ | 10.76 | ​ | ​ | $ | 4.83 | ​
Schedule of Share-based Payment Arrangement, Expensed and Capitalized Amounts | Stock-based compensation is estimated at the grant date based on the award’s fair value and is recognized on a straight-line basis over the vesting periods, generally four years. Stock-based compensation expense before taxes related to the Company’s stock plans and employee stock purchase plans was allocated as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended June 30, | ​ | Six Months Ended June 30,
​ |  | 2022 |  | 2021 |  | 2022 |  | 2021
Costs of revenues | ​ | $ | 655 | ​ | $ | 538 | ​ | $ | 1,383 | ​ | $ | 1,190
Research and development | ​ |  | 1,810 | ​ |  | 1,126 | ​ |  | 4,978 | ​ |  | 2,714
Selling, general and administrative | ​ |  | 1,407 | ​ |  | 1,078 | ​ |  | 3,064 | ​ |  | 2,207
Stock-based compensation expenses | ​ | $ | 3,872 | ​ | $ | 2,742 | ​ | $ | 9,425 | ​ | $ | 6,111
Schedule of Share-based Payment Arrangement, Options Activity |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | Average | ​ | ​ | ​
​ | ​ | ​ | ​ | Average | ​ | Remaining | ​ | Aggregate
​ | ​ | Number of | ​ | Exercise | ​ | Contractual | ​ | Intrinsic
​ | ​ | Options | ​ | Price | ​ | Term | ​ | Value
​ |  | (in thousands) |  | per Share |  | (Years) |  | (in thousands)
Outstanding, January 1, 2022 |  | 226 | ​ | $ | 12.78 |  |  |  | ​ |
Granted |  | — | ​ | ​ | — |  |  |  | ​ |
Exercised |  | (87) | ​ | ​ | 9.10 |  |  |  | ​ |
Canceled |  | (4) | ​ | ​ | 13.30 |  |  |  | ​ |
Expired |  | (2) | ​ | ​ | 8.79 |  |  |  | ​ |
Outstanding, June 30, 2022 |  | 133 | ​ | $ | 15.19 |  | 3.80 | ​ | $ | 848
Vested and expected to vest, June 30, 2022 |  | 133 | ​ | $ | 15.18 |  | 3.78 | ​ | $ | 843
Exercisable, June 30, 2022 |  | 112 | ​ | $ | 15.16 |  | 3.22 | ​ | $ | 714
Schedule of Share-based Payment Arrangement, Restricted Stock Unit Activity |
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Average Grant
​ | ​ | Shares | ​ | Date Fair Value
​ |  | (in thousands) |  | Per Share
Nonvested, January 1, 2022 |  | 1,872 | ​ | $ | 18.24
Granted |  | 331 | ​ | $ | 27.24
Vested |  | (462) | ​ | $ | 17.94
Forfeited |  | (56) | ​ | $ | 19.38
Nonvested, June 30, 2022 |  | 1,685 | ​ | $ | 20.05

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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 grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited 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 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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