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Note 11 - Stockholders' equity (Detail) - Information about the outstanding and exercisable options (USD $) | 12 Months Ended
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Dec. 31, 2012
Range of $3.00 - 3.99 [Member] | Minimum [Member] |
Exercise Price Range, lower range | $ 3.00
Range of $3.00 - 3.99 [Member] | Maximum [Member] |
Exercise Price Range, upper range | $ 3.99
Range of $3.00 - 3.99 [Member] |
Options outstanding, number outstanding (in Shares) | 72,000
Options outstanding, weighted average remaining contractual | 4 years 346 days
Options outstanding, weighted average exercise price | $ 3.65
Options outstanding, intrinsic value (in Dollars) | $ 428,400
Options exercisable, number exercisable (in Shares) | 72,000
Options exercisable, weighted average exercise price | $ 3.65
Options exercisable, intrinsic value (in Dollars) | 428,400
Range of $4.00 - 4.49 [Member] | Minimum [Member] |
Exercise Price Range, lower range | $ 4.00
Range of $4.00 - 4.49 [Member] | Maximum [Member] |
Exercise Price Range, upper range | $ 4.49
Range of $4.00 - 4.49 [Member] |
Options outstanding, number outstanding (in Shares) | 15,930
Options outstanding, weighted average remaining contractual | 357 days
Options outstanding, weighted average exercise price | $ 4.25
Options outstanding, intrinsic value (in Dollars) | 85,226
Options exercisable, number exercisable (in Shares) | 15,930
Options exercisable, weighted average exercise price | $ 4.25
Options exercisable, intrinsic value (in Dollars) | 85,226
Range of $4.50 - 4.99 [Member] | Minimum [Member] |
Exercise Price Range, lower range | $ 4.50
Range of $4.50 - 4.99 [Member] | Maximum [Member] |
Exercise Price Range, upper range | $ 4.99
Range of $4.50 - 4.99 [Member] |
Options outstanding, number outstanding (in Shares) | 100,000
Options outstanding, weighted average remaining contractual | 4 years 284 days
Options outstanding, weighted average exercise price | $ 4.62
Options outstanding, intrinsic value (in Dollars) | 498,000
Options exercisable, number exercisable (in Shares) | 62,500
Options exercisable, weighted average exercise price | $ 4.62
Options exercisable, intrinsic value (in Dollars) | 311,250
Range of $5.00 - 5.99 [Member] | Minimum [Member] |
Exercise Price Range, lower range | $ 5.00
Range of $5.00 - 5.99 [Member] | Maximum [Member] |
Exercise Price Range, upper range | $ 5.99
Range of $5.00 - 5.99 [Member] |
Options outstanding, number outstanding (in Shares) | 6,650
Options outstanding, weighted average remaining contractual | 1 year 29 days
Options outstanding, weighted average exercise price | $ 5.90
Options outstanding, intrinsic value (in Dollars) | 24,605
Options exercisable, number exercisable (in Shares) | 6,650
Options exercisable, weighted average exercise price | $ 5.90
Options exercisable, intrinsic value (in Dollars) | 24,605
Range of $6.00 - 7.99 [Member] | Minimum [Member] |
Exercise Price Range, lower range | $ 6.00
Range of $6.00 - 7.99 [Member] | Maximum [Member] |
Exercise Price Range, upper range | $ 7.99
Range of $6.00 - 7.99 [Member] |
Options outstanding, number outstanding (in Shares) | 9,800
Options outstanding, weighted average remaining contractual | 8 years 14 days
Options outstanding, weighted average exercise price | $ 7.90
Options outstanding, intrinsic value (in Dollars) | 16,660
Options exercisable, number exercisable (in Shares) | 9,800
Options exercisable, weighted average exercise price | $ 7.90
Options exercisable, intrinsic value (in Dollars) | 16,660
Range of $8.00 - 11.99 [Member] | Minimum [Member] |
Exercise Price Range, lower range | $ 8.00
Range of $8.00 - 11.99 [Member] | Maximum [Member] |
Exercise Price Range, upper range | $ 11.99
Range of $8.00 - 11.99 [Member] |
Options outstanding, number outstanding (in Shares) | 200
Options outstanding, weighted average remaining contractual | 9 years
Options outstanding, weighted average exercise price | $ 11.51
Options outstanding, intrinsic value (in Dollars) | 0
Options exercisable, number exercisable (in Shares) | 200
Options exercisable, weighted average exercise price | $ 11.51
Options exercisable, intrinsic value (in Dollars) | $ 0

X
- 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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X
- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(c), d(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(c) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph d(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(b) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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 3: 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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(a) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(a) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + 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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- 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 Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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 Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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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