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Note 6 - Shareholders' Equity - Options Range of Exercise Prices (Details) - $ / shares | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020
Upper range limit (in dollars per share) | $ 9.96 |
Options outstanding, number of outstanding options (in shares) | 1,306,824 |
Options outstanding, weighted-average remaining contractual life (Year) | 4 years 2 months 19 days |
Options outstanding, weighted-average exercise price (in dollars per share) | $ 6.87 |
Options exercisable, number of options exercisable (in shares) | 745,288 |
Options exercisable, weighted-average exercise price (in dollars per share) | $ 6.85 | $ 5.82
Range One [Member] |  |
Upper range limit (in dollars per share) | $ 5.31 |
Options outstanding, number of outstanding options (in shares) | 325,579 |
Options outstanding, weighted-average remaining contractual life (Year) | 2 years 8 months 4 days |
Options outstanding, weighted-average exercise price (in dollars per share) | $ 4.58 |
Options exercisable, number of options exercisable (in shares) | 240,579 |
Options exercisable, weighted-average exercise price (in dollars per share) | $ 4.34 |
Range Two [Member] |  |
Upper range limit (in dollars per share) | $ 6.51 |
Options outstanding, number of outstanding options (in shares) | 321,411 |
Options outstanding, weighted-average remaining contractual life (Year) | 4 years 4 months 9 days |
Options outstanding, weighted-average exercise price (in dollars per share) | $ 6.28 |
Options exercisable, number of options exercisable (in shares) | 166,602 |
Options exercisable, weighted-average exercise price (in dollars per share) | $ 6.07 |
Range Three [Member] |  |
Upper range limit (in dollars per share) | $ 7.16 |
Options outstanding, number of outstanding options (in shares) | 205,750 |
Options outstanding, weighted-average remaining contractual life (Year) | 6 years 5 months 12 days |
Options outstanding, weighted-average exercise price (in dollars per share) | $ 6.97 |
Options exercisable, number of options exercisable (in shares) | 11,667 |
Options exercisable, weighted-average exercise price (in dollars per share) | $ 7.09 |
Range Four [Member] |  |
Upper range limit (in dollars per share) | $ 9.96 |
Options outstanding, number of outstanding options (in shares) | 454,084 |
Options outstanding, weighted-average remaining contractual life (Year) | 4 years 2 months 19 days |
Options outstanding, weighted-average exercise price (in dollars per share) | $ 8.88 |
Options exercisable, number of options exercisable (in shares) | 326,440 |
Options exercisable, weighted-average exercise price (in dollars per share) | $ 9.08 |

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- Definition The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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