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Note 11 - Summary of Outstanding Options by Exercise Price Ranges (Details) | 12 Months Ended
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Dec. 31, 2015 $ / shares shares
Range 1 [Member] |
Exercise price range, lower limit (in dollars per share) | $ 4.27
Exercise price range, upper limit (in dollars per share) | $ 4.41
Options outstanding, option shares (in shares) | shares | 23,400
Options outstanding, weighted average exercise price (in dollars per share) | $ 4.39
Options outstanding, weighted average maturity | 5 years 3 days
Options exercisable, option shares (in shares) | shares | 23,400
Options exercisable, weighted average exercise price (in dollars per share) | $ 4.39
Options exercisable, weighted average maturity | 5 years 3 days
Range 2 [Member] |
Exercise price range, lower limit (in dollars per share) | $ 4.80
Exercise price range, upper limit (in dollars per share) | $ 4.96
Options outstanding, option shares (in shares) | shares | 12,000
Options outstanding, weighted average exercise price (in dollars per share) | $ 4.80
Options outstanding, weighted average maturity | 5 years 102 days
Options exercisable, option shares (in shares) | shares | 12,000
Options exercisable, weighted average exercise price (in dollars per share) | $ 4.80
Options exercisable, weighted average maturity | 5 years 102 days
Range 3 [Member] |
Exercise price range, lower limit (in dollars per share) | $ 5.30
Exercise price range, upper limit (in dollars per share) | $ 6.87
Options outstanding, option shares (in shares) | shares | 33,000
Options outstanding, weighted average exercise price (in dollars per share) | $ 5.86
Options outstanding, weighted average maturity | 6 years 127 days
Options exercisable, option shares (in shares) | shares | 33,000
Options exercisable, weighted average exercise price (in dollars per share) | $ 5.86
Options exercisable, weighted average maturity | 6 years 127 days
Exercise price range, lower limit (in dollars per share) |
Exercise price range, upper limit (in dollars per share) |
Options outstanding, option shares (in shares) | shares | 68,400
Options outstanding, weighted average exercise price (in dollars per share) | $ 5.17
Options outstanding, weighted average maturity | 5 years 255 days
Options exercisable, option shares (in shares) | shares | 68,400
Options exercisable, weighted average exercise price (in dollars per share) | $ 5.17
Options exercisable, weighted average maturity | 5 years 255 days

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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://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=6415400&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=6415400&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=6415400&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=6415400&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=6415400&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(2) -URI http://asc.fasb.org/extlink&oid=6415400&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=6415400&loc=d3e5070-113901 + Details
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