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Note 8 - Stock Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2021
Notes Tables |
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] |
|  | Shares |  |  | Weighted average grant date price |
Non-vested, December 31, 2019 |  |  | 255,771 |  |  | $ | 7.18 |
Granted |  |  | 110,639 |  |  |  | 6.71 |
Forfeited |  |  | (9,454 | ) |  |  | 7.14 |
Vested |  |  | (89,449 | ) |  |  | 6.64 |
Non-vested, December 31, 2020 |  |  | 267,507 |  |  |  | 7.21 |
Granted |  |  | 112,255 |  |  |  | 19.18 |
Forfeited |  |  | (7,331 | ) |  |  | 8.51 |
Vested |  |  | (176,326 | ) |  |  | 10.38 |
Non-vested, December 31, 2021 |  |  | 196,105 |  |  |  | 11.26 |
Share-based Payment Arrangement, Option, Activity [Table Text Block] |
|  | Number of shares underlying options |  |  | Weighted average exercise price per share |  |  | Weighted average grant date fair value |
Outstanding, December 31, 2019 |  |  | 29,165 |  |  | $ | 7.20 |  |  | $ | 3.76 |
Forfeited |  |  | (12,083 | ) |  |  | 8.76 |  |  |  | 4.34 |
Outstanding, December 31, 2020 |  |  | 17,082 |  |  |  | 6.10 |  |  |  | 3.36 |
Exercised |  |  | (4,166 | ) |  |  | 8.04 |  |  |  | 4.34 |
Outstanding, December 31, 2021 |  |  | 12,916 |  |  |  | 5.47 |  |  |  | 2.98 |
Schedule of Nonvested Share Activity [Table Text Block] |
|  | Number of shares underlying options |  |  | Weighted average exercise price per share |  |  | Weighted average grant date fair value |
Non-vested, December 31, 2019 |  |  | 5,417 |  |  | $ | 5.48 |  |  | $ | 3.01 |
Vested |  |  | (3,229 | ) |  |  | 5.47 |  |  |  | 2.98 |
Non-vested, December 31, 2020 |  |  | 2,188 |  |  |  | 5.50 |  |  |  | 3.05 |
Vested |  |  | (2,188 | ) |  |  | 5.50 |  |  |  | 3.05 |
Non-vested, December 31, 2021 |  |  | - |  |  |  | - |  |  |  | - |
Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Intrinsic Value [Table Text Block] |
|  | Number of shares underlying options |  |  | Weighted average exercise price per share |  |  | Weighted average remaining contractual life (years) |  |  | Aggregate intrinsic value |
Outstanding |  |  | 12,916 |  |  | $ | 5.47 |  |  |  | 6.23 |  |  | $ | 189,765 |
Exercisable |  |  | 12,916 |  |  |  | 5.47 |  |  |  | 6.23 |  |  |  | 189,765 |

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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + 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)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the total intrinsic value of options exercised (or share units converted), share-based liabilities paid, and the total fair value of shares vested 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 (d)(2) -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 Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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