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Note 11 - Stock Option Plans - Summary of Exercise Prices, Weighted Average Remaining Contractual Life and Intrinsic Values of Outstanding Options (Details) | 12 Months Ended
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Dec. 31, 2016 USD ($) $ / shares shares
Number outstanding (in shares) | shares | 474,501
Weighted average exercise price per share, options outstanding (in dollars per share) | $ 12.67
Weighted average remaining contractual life (years), options outstanding (Year) | 3 years 182 days
Aggregate intrinsic value, options outstanding | $ | $ 10,716,502
Number exercisable (in shares) | shares | 332,192
Weighted average exercise price per share, options exercisable (in dollars per share) | $ 10.08
Weighted average remaining contractual life (years), options exercisable (Year) | 2 years 328 days
Aggregate intrinsic value, options exercisable (in Dollars) | $ | $ 8,359,847
Exercise Price Range 01 [Member] |
Exercise price - lower (in dollars per share) | $ 2.80
Exercise price - higher (in dollars per share) | $ 4.48
Number outstanding (in shares) | shares | 51,771
Weighted average exercise price per share, options outstanding (in dollars per share) | $ 2.95
Weighted average remaining contractual life (years), options outstanding (Year) | 1 year 73 days
Aggregate intrinsic value, options outstanding | $ | $ 1,671,976
Number exercisable (in shares) | shares | 51,771
Weighted average exercise price per share, options exercisable (in dollars per share) | $ 2.95
Weighted average remaining contractual life (years), options exercisable (Year) | 1 year 73 days
Aggregate intrinsic value, options exercisable (in Dollars) | $ | $ 1,671,976
Exercise Price Range 02 [Member] |
Exercise price - lower (in dollars per share) | $ 5.52
Exercise price - higher (in dollars per share) | $ 8.92
Number outstanding (in shares) | shares | 171,705
Weighted average exercise price per share, options outstanding (in dollars per share) | $ 6.64
Weighted average remaining contractual life (years), options outstanding (Year) | 2 years 146 days
Aggregate intrinsic value, options outstanding | $ | $ 4,912,868
Number exercisable (in shares) | shares | 157,723
Weighted average exercise price per share, options exercisable (in dollars per share) | $ 6.47
Weighted average remaining contractual life (years), options exercisable (Year) | 2 years 109 days
Aggregate intrinsic value, options exercisable (in Dollars) | $ | $ 4,539,689
Exercise Price Range 03 [Member] |
Exercise price - lower (in dollars per share) | $ 10.16
Exercise price - higher (in dollars per share) | $ 14.67
Number outstanding (in shares) | shares | 29,375
Weighted average exercise price per share, options outstanding (in dollars per share) | $ 10.83
Weighted average remaining contractual life (years), options outstanding (Year) | 3 years 255 days
Aggregate intrinsic value, options outstanding | $ | $ 717,287
Number exercisable (in shares) | shares | 19,998
Weighted average exercise price per share, options exercisable (in dollars per share) | $ 11.15
Weighted average remaining contractual life (years), options exercisable (Year) | 3 years 219 days
Aggregate intrinsic value, options exercisable (in Dollars) | $ | $ 482,018
Exercise Price Range 04 [Member] |
Exercise price - lower (in dollars per share) | $ 15.51
Exercise price - higher (in dollars per share) | $ 19.95
Number outstanding (in shares) | shares | 131,150
Weighted average exercise price per share, options outstanding (in dollars per share) | $ 17.37
Weighted average remaining contractual life (years), options outstanding (Year) | 4 years 219 days
Aggregate intrinsic value, options outstanding | $ | $ 2,344,893
Number exercisable (in shares) | shares | 72,700
Weighted average exercise price per share, options exercisable (in dollars per share) | $ 17.18
Weighted average remaining contractual life (years), options exercisable (Year) | 4 years 109 days
Aggregate intrinsic value, options exercisable (in Dollars) | $ | $ 1,314,039
Exercise Price Range 05 [Member] |
Exercise price - lower (in dollars per share) | $ 21.10
Exercise price - higher (in dollars per share) | $ 24.96
Number outstanding (in shares) | shares | 71,750
Weighted average exercise price per share, options outstanding (in dollars per share) | $ 22.36
Weighted average remaining contractual life (years), options outstanding (Year) | 5 years 146 days
Aggregate intrinsic value, options outstanding | $ | $ 924,728
Number exercisable (in shares) | shares | 30,000
Weighted average exercise price per share, options exercisable (in dollars per share) | $ 23.51
Weighted average remaining contractual life (years), options exercisable (Year) | 4 years 182 days
Aggregate intrinsic value, options exercisable (in Dollars) | $ | $ 352,125
Exercise Price Range 06 [Member] |
Exercise price - lower (in dollars per share) | $ 24.96
Exercise price - higher (in dollars per share) | $ 27.53
Number outstanding (in shares) | shares | 18,750
Weighted average exercise price per share, options outstanding (in dollars per share) | $ 27.53
Weighted average remaining contractual life (years), options outstanding (Year) | 4 years 255 days
Aggregate intrinsic value, options outstanding | $ | $ 144,750
Number exercisable (in shares) | shares |
Weighted average exercise price per share, options exercisable (in dollars per share) |
Weighted average remaining contractual life (years), options exercisable (Year) |
Aggregate intrinsic value, options exercisable (in Dollars) | $ |

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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 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 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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