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Note 11 - Stockholders' equity (Detail) (USD $) | 1 Months Ended | 12 Months Ended |  | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 27, 2011 | Nov. 30, 2006 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 12, 2007 | Dec. 31, 2011 Director [Member] The 2001 Non-Qualified Stock Option Plan [Member] | Dec. 31, 2012 Director [Member] The 2007 Share Incentive Plan [Member] | Dec. 31, 2011 Director [Member] The 2007 Share Incentive Plan [Member] | Dec. 31, 2010 Director [Member] The 2007 Share Incentive Plan [Member] | Dec. 31, 2011 Directors and Key Employees [Member] The 2007 Share Incentive Plan [Member] | Dec. 31, 2012 The 1989 Non-Qualified Stock Option Plan [Member] Minimum [Member] | Dec. 31, 2012 The 1989 Non-Qualified Stock Option Plan [Member] Maximum [Member] | Dec. 31, 2012 The 1989 Non-Qualified Stock Option Plan [Member] | Dec. 31, 2011 The 1989 Non-Qualified Stock Option Plan [Member] | Dec. 31, 2010 The 1989 Non-Qualified Stock Option Plan [Member] | Jun. 15, 1989 The 1989 Non-Qualified Stock Option Plan [Member] | Dec. 31, 2012 The 2001 Non-Qualified Stock Option Plan [Member] | Dec. 31, 2011 The 2001 Non-Qualified Stock Option Plan [Member] | Dec. 31, 2010 The 2001 Non-Qualified Stock Option Plan [Member] | Dec. 31, 2012 The 2007 Share Incentive Plan [Member] | Dec. 31, 2011 The 2007 Share Incentive Plan [Member] | Dec. 31, 2010 The 2007 Share Incentive Plan [Member] | Dec. 31, 2012 Three Plans [Member] | Dec. 31, 2012 Selling, General and Administrative Expenses [Member] | Dec. 31, 2011 Selling, General and Administrative Expenses [Member] | Dec. 31, 2012 Minimum [Member] | Dec. 31, 2012 Maximum [Member]
Stock Issued During Period, Shares, New Issues | 967,950 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Price (in Dollars per share) | $ 10.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock (in Dollars) | $ 9,387,666 |  |  | $ 9,387,666 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance |  | 300,000 |  |  | 750,000 |  |  |  |  |  |  |  |  |  |  | 700,000 |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  | 4 years |  |  |  |  |  |  |  |  |  |  | 4 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award Expiration |  |  |  |  |  |  |  |  |  |  | 5 years | 7 years |  |  |  |  |  | 10 years |  |  | 10 years |  |  |  |  | 7 years | 10 years
Common Stock, Par or Stated Value Per Share (in Dollars per share) |  | $ 0.01 | $ 0.01 | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  |  |  | 14,000 | 8,000 | 200 | 16,500 | 40,400 |  |  | 0 | 0 |  |  | 0 | 14,000 |  | 0 | 0 |  |  |  |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in Dollars per share) |  |  |  |  |  | $ 7.90 |  |  |  |  |  |  | $ 0 | $ 0 |  |  | $ 4.25 | $ 4.25 |  | $ 11.51 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25% |  |  |  |  |  |  |  |  |
Share-based Compensation (in Dollars) |  |  | 234,858 | 290,598 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |  |  |  |  |  |  |  |  |  |  |  |  | 41,900 | 102,000 | 180,250 |  | 162,480 | 170,590 | 211,300 | 200 | 200 | 200 | 204,580 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  |  | 68,210 | 131,560 |  |  |  |  |  |  |  |  | 60,100 | 78,250 |  |  | 8,110 | 53,310 |  | 0 | 0 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value (in Dollars) |  |  | 442,907 | 1,522,715 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense (in Dollars) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 235,000 | $ 291,000 |  |

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- Definition Face amount or stated value of common stock per share; generally not indicative of the fair market value per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4 -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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant 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 (a)(1) -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 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 The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the 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 (d)(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 c(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 Gross number of share options (or share units) granted during the period. + References No definition available. + 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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