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Note 12 - Stock-based Compensation - Number of Stock Option Awards Exercisable and their Weighted Average Exercise Price (Details) | 12 Months Ended
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Dec. 31, 2021 $ / shares shares
Upper Exercise Price Range (in dollars per share) | $ 18
Outstanding Number (in shares) | shares | 33,093
Outstanding Weighted Average Remaining Life (Year) | 7 years 6 months
Outstanding Weighted Average Exercise Price (in dollars per share) | $ 7.68
Exercisable Number (in shares) | shares | 15,561
Exercisable Weighted Average Exercise Price (in dollars per share) | $ 6.34
Exercise Price Range 01 [Member] |
Upper Exercise Price Range (in dollars per share) | $ 3
Outstanding Number (in shares) | shares | 1,874
Outstanding Weighted Average Remaining Life (Year) | 5 years 10 months 24 days
Outstanding Weighted Average Exercise Price (in dollars per share) | $ 2.30
Exercisable Number (in shares) | shares | 1,158
Exercisable Weighted Average Exercise Price (in dollars per share) | $ 2.12
Exercise Price Range 02 [Member] |
Upper Exercise Price Range (in dollars per share) | $ 6
Outstanding Number (in shares) | shares | 10,190
Outstanding Weighted Average Remaining Life (Year) | 6 years 6 months
Outstanding Weighted Average Exercise Price (in dollars per share) | $ 4.22
Exercisable Number (in shares) | shares | 7,317
Exercisable Weighted Average Exercise Price (in dollars per share) | $ 4.41
Exercise Price Range 03 [Member] |
Upper Exercise Price Range (in dollars per share) | $ 9
Outstanding Number (in shares) | shares | 10,599
Outstanding Weighted Average Remaining Life (Year) | 8 years 2 months 12 days
Outstanding Weighted Average Exercise Price (in dollars per share) | $ 7.89
Exercisable Number (in shares) | shares | 4,317
Exercisable Weighted Average Exercise Price (in dollars per share) | $ 7.56
Exercise Price Range 04 [Member] |
Upper Exercise Price Range (in dollars per share) | $ 12
Outstanding Number (in shares) | shares | 8,228
Outstanding Weighted Average Remaining Life (Year) | 8 years 1 month 6 days
Outstanding Weighted Average Exercise Price (in dollars per share) | $ 11.14
Exercisable Number (in shares) | shares | 2,120
Exercisable Weighted Average Exercise Price (in dollars per share) | $ 10.86
Exercise Price Range 05 [Member] |
Upper Exercise Price Range (in dollars per share) | $ 15
Outstanding Number (in shares) | shares | 1,291
Outstanding Weighted Average Remaining Life (Year) | 6 years 9 months 18 days
Outstanding Weighted Average Exercise Price (in dollars per share) | $ 13.10
Exercisable Number (in shares) | shares | 535
Exercisable Weighted Average Exercise Price (in dollars per share) | $ 12.31
Exercise Price Range 06 [Member] |
Upper Exercise Price Range (in dollars per share) | $ 18
Outstanding Number (in shares) | shares | 911
Outstanding Weighted Average Remaining Life (Year) | 9 years
Outstanding Weighted Average Exercise Price (in dollars per share) | $ 15.95
Exercisable Number (in shares) | shares | 114
Exercisable Weighted Average Exercise Price (in dollars per share) | $ 15.56

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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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