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Note 13 - Stock Options Outstanding (Details) | 12 Months Ended
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Dec. 31, 2015 USD ($) $ / shares shares
Options Outstanding Exercise Price Range1 [Member] |
Lower range of exercise price (in dollars per share) | $ 0.69
Upper range of exercise price (in dollars per share) | $ 2.08
Number outstanding (in shares) | shares | 238,500
Wgt. avg. contractual life remaining (yrs) | 5 years 255 days
Outstanding at December 31 (in dollars per share) | $ 1.52
Aggregate intrinsic value | $ | $ 356,145
Options Outstanding Exercise Price Range2 [Member] |
Lower range of exercise price (in dollars per share) | $ 2.97
Upper range of exercise price (in dollars per share) | $ 3.84
Number outstanding (in shares) | shares | 36,000
Wgt. avg. contractual life remaining (yrs) | 4 years 146 days
Outstanding at December 31 (in dollars per share) | $ 3.37
Aggregate intrinsic value | $ | $ 54,960
Options Outstanding Exercise Price Range 3 [Member] |
Lower range of exercise price (in dollars per share) | $ 0.69
Upper range of exercise price (in dollars per share) | $ 3.84
Number outstanding (in shares) | shares | 274,500
Wgt. avg. contractual life remaining (yrs) | 5 years 182 days
Outstanding at December 31 (in dollars per share) | $ 1.76
Aggregate intrinsic value | $ | $ 411,105
Number outstanding (in shares) | shares | 274,500
Outstanding at December 31 (in dollars per share) | $ 1.76

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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 Number of options outstanding, including both vested and non-vested options. + 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 Reference 2: 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 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 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 remaining contractual term for option awards outstanding, 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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