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Note 6 - Stock-based Compensation - Nonvested Option Awards Activity (Details) - $ / shares | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Nonvested, shares (in shares) | 482,500 | 380,000 | 235,000 | 13,000 | 18,500 | 23,500 | 235,000 | 23,500
Nonvested, weighted average grant date fair value (in dollars per share) | $ 0.81 | $ 0.94 | $ 0.36 | $ 0.09 | $ 0.15 | $ 0.17 | $ 0.36 | $ 0.17
Options granted, shares (in shares) | 30,000 | 127,500 | 145,000 | 210,000 | 10,000 | 0 | 302,500 | 220,000
Granted, weighted average grant date fair value (in dollars per share) | $ 1.15 | $ 1.19 | $ 1.22 | $ 0.37 | $ 0.08 | $ 0 |  |
Vested, shares (in shares) | (215,000) | (25,000) | 0 | (1,500) | (15,500) | (5,000) |  |
Vested, weighted average grant date fair value (in dollars per share) | $ 0.41 | $ 1.01 | $ 0 | $ 0.12 | $ 0.16 | $ 0.21 |  |
Forfeited, shares (in shares) | 0 | 0 | 0 | 0 | 0 | 0 |  |
Forfeited, weighted average grant date fair value (in dollars per share) | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 |  |
Nonvested, shares (in shares) | 297,500 | 482,500 | 380,000 | 221,500 | 13,000 | 18,500 | 297,500 | 221,500
Nonvested, weighted average grant date fair value (in dollars per share) | $ 1.13 | $ 0.81 | $ 0.94 | $ 0.36 | $ 0.09 | $ 0.15 | $ 1.13 | $ 0.36

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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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