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Note 8 - Common shares: (Detail) (USD $) | 1 Months Ended | 0 Months Ended | 1 Months Ended | 0 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 31, 2013 | Mar. 16, 2012 | Jan. 23, 2012 | Nov. 11, 2011 | Feb. 16, 2010 | Dec. 31, 2012 | Dec. 31, 2011
Common Stock, Shares Authorized |  |  |  |  |  | 250,000,000 | 250,000,000
Common Stock, Shares, Outstanding |  |  | 46,047,053 |  |  | 44,322,159 | 53,497,584
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  | 7,570,236 | 3,840,000 |  |  |
Treasury Stock Acquired, Average Cost Per Share (in Dollars per share) |  |  | $ 0.77 |  |  |  |
Stock Repurchased During Period, Value (in Dollars) | $ 6,171,656 |  | $ 5,829,082 | $ 18,442 |  |  |
Stock Repurchased And Retired During Period Transaction Cost (in Dollars) |  |  | 64,000 |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity (in Dollars) |  |  | 4,000,000 |  |  |  |
Stock Repurchased During Period, Shares |  |  | 4,114,437 | 23,765 | 2,371,204 |  |
Share Price (in Dollars per share) |  |  | $ 1.50 | $ 0.78 |  |  |
Stock Repurchase Program, Authorized Amount (in Dollars) |  | $ 3,840,000 |  |  |  |  |

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- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 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-Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 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 210.5-02.19(b),22(b)) -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 19, 22 -Article 5 + Details
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