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Note 11 - Stockholders's Equity: (Details) - Unaudited table summarizes stockholders’ equity transactions: (USD $) | 0 Months Ended | 3 Months Ended | 6 Months Ended |
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Dec. 15, 2011 | Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Jan. 31, 2012
Note 11 - Stockholders's Equity: (Details) - Unaudited table summarizes stockholders’ equity transactions: [Line Items] |  |  |  |  |  |
Balances, (in Shares) |  | 40,121,797 |  | 44,322,159 |  | 40,226,875
Balances, |  | $ 9,297,924 |  | $ 10,084,417 |  |
Balances, |  | 28,293,757 |  | 33,931,529 |  |
Balances, |  | (17,433,264) |  | (17,509,843) |  |
Balances, |  | (141,681) |  | 44,104 |  |
Balances, |  | 20,016,736 |  | 26,550,207 |  |
Balances, (in Shares) |  | 40,641,488 |  | 40,641,488 |  | 40,226,875
Balances, |  | 9,755,391 |  | 9,755,391 |  |
Balances, |  | 28,207,230 |  | 28,207,230 |  |
Balances, |  | (16,845,634) |  | (16,845,634) |  |
Balances, |  | (402,622) |  | (402,622) |  |
Balances, |  | 20,714,365 |  | 20,714,365 |  |
Exercise of stock options (in Shares) |  | 519,716 | 378,936 | 576,573 | 673,153 |
Exercise of stock options |  | 457,467 |  | 522,476 |  |
Exercise of stock options |  | (177,782) |  | (204,282) |  |
Exercise of stock options |  | 279,685 |  | 318,194 |  |
Repurchase and retirement of shares (in Shares) |  |  | 1,115,304 | (4,114,121) |  |
Repurchase and retirement of shares | (6,171,656) | (259,875) |  | (259,875) |  |
Repurchase and retirement of shares |  |  |  | (5,454,854) |  |
Repurchase and retirement of shares |  |  |  | (6,277,741) |  |
Normal Course Issuer Bid (in Shares) |  |  | 1,115,304 | (4,114,121) |  |
Normal Course Issuer Bid | (6,171,656) | (259,875) |  | (259,875) |  |
Normal Course Issuer Bid |  |  |  | (5,454,854) |  |
Normal Course Issuer Bid |  |  |  | (6,277,741) |  |
Cancellation of restricted stock (in Shares) |  | (25) |  | (50) |  |
Stock-based compensation |  | 91,255 |  | 166,097 |  |
Stock-based compensation |  | 91,255 |  | 166,097 |  |
Net income for the period |  | 587,630 | 695,998 | 664,209 | 2,359,617 |
Net income for the period |  | 587,630 | 695,998 | 664,209 | 2,359,617 |
Unrealized loss on foreign currency forward contracts treated as hedges |  | (256,782) |  | (256,782) |  |
Unrealized loss on foreign currency forward contracts treated as hedges |  | (256,782) |  | (442,567) |  |
Reclassification to net income due to settlement of foreign currency forward contracts treated as hedges |  | (4,159) |  | (4,159) |  |
Reclassification to net income due to settlement of foreign currency forward contracts treated as hedges |  | (4,159) |  | (4,159) |  |
Normal Course Issuer Bid Member |  |  |  |  |  |
Note 11 - Stockholders's Equity: (Details) - Unaudited table summarizes stockholders’ equity transactions: [Line Items] |  |  |  |  |  |
Repurchase and retirement of shares (in Shares) |  | (143,073) |  | (143,073) |  |
Repurchase and retirement of shares |  |  |  | (28,615) |  |
Repurchase and retirement of shares |  |  |  | (231,260) |  |
Repurchase and retirement of shares |  |  |  | (259,875) |  |
Normal Course Issuer Bid (in Shares) |  | (143,073) |  | (143,073) |  |
Normal Course Issuer Bid |  |  |  | (28,615) |  |
Normal Course Issuer Bid |  |  |  | (231,260) |  |
Normal Course Issuer Bid |  |  |  | $ (259,875) |  |

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- Definition Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration