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Note 11 - Outstanding and Exercisable Options (Details) | 12 Months Ended
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Dec. 31, 2016 USD ($) $ / shares shares
Exercise Price Range 1 [Member] |
Exercise price range, lower limit (in dollars per share) | $ 3
Exercise price range, upper limit (in dollars per share) | $ 3.99
Number of options outstanding (in shares) | shares | 34,000
Number of options outstanding, weighted average remaining contractual term (Year) | 1 year 346 days
Number of options outstanding, weighted average exercise price (in dollars per share) | $ 3.65
Number of options outstanding, intrinsic value | $ | $ 171,020
Number of options exercisable (in shares) | shares | 34,000
Number exercisable, weighted average exercise price (in dollars per share) | $ 3.65
Number of options exercisable, intrinsic value | $ | $ 171,020
Exercise Price Range 2 [Member] |
Exercise price range, lower limit (in dollars per share) | $ 4
Exercise price range, upper limit (in dollars per share) | $ 4.49
Number of options outstanding (in shares) | shares | 15,930
Number of options outstanding, weighted average remaining contractual term (Year) | 4 years 14 days
Number of options outstanding, weighted average exercise price (in dollars per share) | $ 4.25
Number of options outstanding, intrinsic value | $ | $ 70,570
Number of options exercisable (in shares) | shares | 15,930
Number exercisable, weighted average exercise price (in dollars per share) | $ 4.25
Number of options exercisable, intrinsic value | $ | $ 70,570
Exercise Price Range 3 [Member] |
Exercise price range, lower limit (in dollars per share) | $ 5
Exercise price range, upper limit (in dollars per share) | $ 7.99
Number of options outstanding (in shares) | shares | 9,800
Number of options outstanding, weighted average remaining contractual term (Year) | 5 years 14 days
Number of options outstanding, weighted average exercise price (in dollars per share) | $ 7.90
Number of options outstanding, intrinsic value | $ | $ 7,644
Number of options exercisable (in shares) | shares | 9,800
Number exercisable, weighted average exercise price (in dollars per share) | $ 7.90
Number of options exercisable, intrinsic value | $ | $ 7,644
Exercise Price Range 4 [Member] |
Exercise price range, lower limit (in dollars per share) | $ 8
Exercise price range, upper limit (in dollars per share) | $ 12
Number of options outstanding (in shares) | shares | 225,000
Number of options outstanding, weighted average remaining contractual term (Year) | 6 years 233 days
Number of options outstanding, weighted average exercise price (in dollars per share) | $ 9.43
Number of options outstanding, intrinsic value | $ | $ 0
Number of options exercisable (in shares) | shares | 65,000
Number exercisable, weighted average exercise price (in dollars per share) | $ 9.43
Number of options exercisable, intrinsic value | $ | $ 0

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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + 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 Amount by which the current fair value of the underlying stock exceeds the exercise price of options 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 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&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://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 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&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=6415400&loc=d3e5070-113901 + Details
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