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Note 8 - Stock-based Compensation - Summary of Outstanding Stock Options by Exercise Price Range (Details) | 12 Months Ended
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Dec. 31, 2021 $ / shares shares
Number of Options (in shares) | shares | 434,500
Weighted- Average Remaining Contractual Life (Year) | 3 years 1 month 6 days
Weighted-Average Exercise Price (in dollars per share) | $ 3.05
Range One [Member] |
Lower Range Limit (in dollars per share) | 0.96
Upper Range Limit (in dollars per share) | $ 1.27
Number of Options (in shares) | shares | 88,000
Weighted- Average Remaining Contractual Life (Year) | 5 years 10 months 24 days
Weighted-Average Exercise Price (in dollars per share) | $ 0.97
Range Two [Member] |
Lower Range Limit (in dollars per share) | 1.28
Upper Range Limit (in dollars per share) | $ 3.00
Number of Options (in shares) | shares | 132,000
Weighted- Average Remaining Contractual Life (Year) | 3 years 7 months 6 days
Weighted-Average Exercise Price (in dollars per share) | $ 2.26
Range Three [Member] |
Lower Range Limit (in dollars per share) | 3.01
Upper Range Limit (in dollars per share) | $ 4.54
Number of Options (in shares) | shares | 120,000
Weighted- Average Remaining Contractual Life (Year) | 1 year
Weighted-Average Exercise Price (in dollars per share) | $ 3.72
Range Four [Member] |
Lower Range Limit (in dollars per share) | 4.55
Upper Range Limit (in dollars per share) | $ 5.22
Number of Options (in shares) | shares | 94,500
Weighted- Average Remaining Contractual Life (Year) | 2 years 4 months 24 days
Weighted-Average Exercise Price (in dollars per share) | $ 5.22

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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 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 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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