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Note 2 - Significant Accounting Policies (Details) - Summary of Stock Option Activity Under Stock Option Plans (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Summary of Stock Option Activity Under Stock Option Plans [Abstract] |  |  |  |
Weighted Average Exercise Price Outstanding | $ 5.04 | $ 4.53 | $ 4.40 | $ 4.35
Number of Shares Outstanding | 84,600 | 121,600 | 115,600 | 103,600
Weighted Average Remaining Contractual Term Outstanding | 7 years 80 days | 4 years 302 days | 5 years 54 days |
Aggregate Intrinsic Value Outstanding | $ 104,656 | $ 206,760 | $ 206,332 |
Weighted Average Exercise Price Exercisable | $ 5.04 | $ 4.53 | $ 4.40 |
Number of Shares Exercisable | 84,600 | 121,600 | 115,600 |
Weighted Average Remaining Contractual Term (in years) Exercisable | 7 years 80 days | 4 years 302 days | 5 years 54 days |
Aggregate Intrinsic Value Exercisable | $ 104,656 | $ 206,760 | $ 206,332 |
Weighted Average Exercise Price Granted | $ 6.87 | $ 5.27 | $ 4.80 |
Number of Shares Granted | 12,000 | 12,000 | 12,000 |
Weighted Average Exercise Price Exercised | $ 4.23 | $ 3.50 |  |
Number of Shares Exercised | (49,000) | (6,000) | 0 |

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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are 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 -Subparagraph (e)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date. + 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 As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest. + 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 Weighted average remaining contractual term for fully vested and expected to vest options that are exercisable or convertible, 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 Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest 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 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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