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Note 10 - Capital Stock and Stock-based Compensation - Outstanding and Exercisable Options (Details) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2021 USD ($) $ / shares shares
Range of Exercise Price, Lower Limit (in dollars per share) | $ 1.78
Range of Exercise Price, Upper Limit (in dollars per share) | $ 5.51
Options Outstanding, Shares Outstanding (in shares) | shares | 1,404,816
Options Outstanding, Weighted Average Remaining Contractual Life (Year) | 5 years 7 months 6 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 3.10
Options Outstanding, Aggregate Intrinsic Value | $ | $ 5,553
Options Exercisable, Shares Exercisable (in shares) | shares | 851,340
Options Exercisable. Weighted Average Remaining Contractual Life (Year) | 5 years 2 months 12 days
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 3.38
Options Exercisable, Aggregate Intrinsic Value | $ | $ 3,125
Exercise Price Range 1 [Member] |
Range of Exercise Price, Lower Limit (in dollars per share) | $ 1.78
Range of Exercise Price, Upper Limit (in dollars per share) | $ 2.62
Options Outstanding, Shares Outstanding (in shares) | shares | 188,253
Options Outstanding, Weighted Average Remaining Contractual Life (Year) | 6 years 4 months 24 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 2.08
Options Outstanding, Aggregate Intrinsic Value | $ | $ 935
Options Exercisable, Shares Exercisable (in shares) | shares | 90,551
Options Exercisable. Weighted Average Remaining Contractual Life (Year) | 6 years 1 month 6 days
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 2.09
Options Exercisable, Aggregate Intrinsic Value | $ | $ 449
Exercise Price Range 2 [Member] |
Range of Exercise Price, Lower Limit (in dollars per share) | $ 2.63
Range of Exercise Price, Upper Limit (in dollars per share) | $ 2.78
Options Outstanding, Shares Outstanding (in shares) | shares | 586,160
Options Outstanding, Weighted Average Remaining Contractual Life (Year) | 5 years 4 months 24 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 2.63
Options Outstanding, Aggregate Intrinsic Value | $ | $ 2,591
Options Exercisable, Shares Exercisable (in shares) | shares | 234,299
Options Exercisable. Weighted Average Remaining Contractual Life (Year) | 5 years 4 months 24 days
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 2.63
Options Exercisable, Aggregate Intrinsic Value | $ | $ 1,036
Exercise Price Range 3 [Member] |
Range of Exercise Price, Lower Limit (in dollars per share) | $ 2.79
Range of Exercise Price, Upper Limit (in dollars per share) | $ 3.24
Options Outstanding, Shares Outstanding (in shares) | shares | 160,071
Options Outstanding, Weighted Average Remaining Contractual Life (Year) | 7 years 7 months 6 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 2.95
Options Outstanding, Aggregate Intrinsic Value | $ | $ 656
Options Exercisable, Shares Exercisable (in shares) | shares | 99,751
Options Exercisable. Weighted Average Remaining Contractual Life (Year) | 7 years 6 months
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 2.95
Options Exercisable, Aggregate Intrinsic Value | $ | $ 409
Exercise Price Range 4 [Member] |
Range of Exercise Price, Lower Limit (in dollars per share) | $ 3.25
Range of Exercise Price, Upper Limit (in dollars per share) | $ 3.72
Options Outstanding, Shares Outstanding (in shares) | shares | 206,808
Options Outstanding, Weighted Average Remaining Contractual Life (Year) | 5 years 2 months 12 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 3.38
Options Outstanding, Aggregate Intrinsic Value | $ | $ 760
Options Exercisable, Shares Exercisable (in shares) | shares | 206,808
Options Exercisable. Weighted Average Remaining Contractual Life (Year) | 5 years 2 months 12 days
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 3.38
Options Exercisable, Aggregate Intrinsic Value | $ | $ 760
Exercise Price Range 5 [Member] |
Range of Exercise Price, Lower Limit (in dollars per share) | $ 3.73
Range of Exercise Price, Upper Limit (in dollars per share) | $ 5.51
Options Outstanding, Shares Outstanding (in shares) | shares | 263,524
Options Outstanding, Weighted Average Remaining Contractual Life (Year) | 4 years 3 months 18 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 4.73
Options Outstanding, Aggregate Intrinsic Value | $ | $ 611
Options Exercisable, Shares Exercisable (in shares) | shares | 219,931
Options Exercisable. Weighted Average Remaining Contractual Life (Year) | 3 years 8 months 12 days
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 4.91
Options Exercisable, Aggregate Intrinsic Value | $ | $ 471

X
- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The floor 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 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 Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + 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 -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 Weighted average remaining contractual term of exercisable 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)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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