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Note 8 - Shareholders' Equity - Options Range of Exercise Prices (Details) | 12 Months Ended
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Dec. 31, 2017 $ / shares shares
Lower range limit (in dollars per share) | $ 3.22
Upper range limit (in dollars per share) | $ 15
Options outstanding, number of outstanding options (in shares) | shares | 1,860,211
Options outstanding, weighted-average remaining contractual life (Year) | 2 years 339 days
Options outstanding, weighted-average exercise price (in dollars per share) | $ 5.06
Options exercisable, number of options exercisable (in shares) | shares | 1,045,798
Options exercisable, weighted-average exercise price (in dollars per share) | $ 4.18
Range One [Member] |
Lower range limit (in dollars per share) | 3.22
Upper range limit (in dollars per share) | $ 3.99
Options outstanding, number of outstanding options (in shares) | shares | 435,398
Options outstanding, weighted-average remaining contractual life (Year) | 3 years 102 days
Options outstanding, weighted-average exercise price (in dollars per share) | $ 3.78
Options exercisable, number of options exercisable (in shares) | shares | 368,406
Options exercisable, weighted-average exercise price (in dollars per share) | $ 3.80
Range Two [Member] |
Lower range limit (in dollars per share) | 4
Upper range limit (in dollars per share) | $ 4.99
Options outstanding, number of outstanding options (in shares) | shares | 510,213
Options outstanding, weighted-average remaining contractual life (Year) | 3 years 98 days
Options outstanding, weighted-average exercise price (in dollars per share) | $ 4.37
Options exercisable, number of options exercisable (in shares) | shares | 335,624
Options exercisable, weighted-average exercise price (in dollars per share) | $ 4.40
Range Three [Member] |
Lower range limit (in dollars per share) | 5
Upper range limit (in dollars per share) | $ 9.99
Options outstanding, number of outstanding options (in shares) | shares | 614,600
Options outstanding, weighted-average remaining contractual life (Year) | 5 years 204 days
Options outstanding, weighted-average exercise price (in dollars per share) | $ 5.69
Options exercisable, number of options exercisable (in shares) | shares | 341,768
Options exercisable, weighted-average exercise price (in dollars per share) | $ 5.77
Range Four [Member] |
Lower range limit (in dollars per share) | 10
Upper range limit (in dollars per share) | $ 15
Options outstanding, number of outstanding options (in shares) | shares | 300,000
Options outstanding, weighted-average remaining contractual life (Year) | 2 years
Options outstanding, weighted-average exercise price (in dollars per share) | $ 12.50
Options exercisable, number of options exercisable (in shares) | shares |
Options exercisable, weighted-average exercise price (in dollars per share) |

X
- 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -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=96867065&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -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=96867065&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://www.xbrl.org/2003/role/presentationRef -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=96867065&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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