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Note 11 - Stockholders's Equity (Details) - Stockholders’ Equity Transactions (USD $) | 3 Months Ended | 9 Months Ended |
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Jan. 31, 2013
Note 11 - Stockholders's Equity (Details) - Stockholders’ Equity Transactions [Line Items] |  |  |  |  |
Common stock, shares (in Shares) |  |  |  |  | 10,056,719
Common stock, amount | $ 31,115,760 |  | $ 26,917,218 |  |
Common stock, shares (in Shares) |  |  |  |  | 10,056,719
Common stock, amount | 33,643,453 |  | 33,643,453 |  |
Exercise of stock options, shares (in Shares) | 134,199 | 733,843 | 474,220 | 877,986 |
Exercise of stock options, amount | 343,953 |  | 2,399,616 |  |
Repurchase and retirement of shares | (1,099,571) |  | (1,181,857) |  |
Stock-based compensation | 230,712 |  | 417,046 |  |
Income tax effect related to stock options exercised | 741,512 |  | 741,512 |  |
Net income for the period | 2,690,905 | 2,593,360 | 4,514,926 | 3,257,569 |
Unrealized loss on foreign currency forward contracts treated as hedges | (437,519) |  | (602,901) |  |
Reclassification to net income due to settlement of foreign currency forward contracts treated as hedges | 57,701 | 92,308 | 437,893 | 119,237 |
Common Stock [Member] |  |  |  |  |
Note 11 - Stockholders's Equity (Details) - Stockholders’ Equity Transactions [Line Items] |  |  |  |  |
Common stock, shares (in Shares) | 11,240,992 |  | 10,907,063 |  |
Common stock, amount | 13,513,124 |  | 11,859,267 |  |
Common stock, shares (in Shares) | 11,301,891 |  | 11,301,891 |  |
Common stock, amount | 13,984,072 |  | 13,984,072 |  |
Exercise of stock options, shares (in Shares) | 134,199 |  | 474,220 |  |
Exercise of stock options, amount | 561,107 |  | 2,219,838 |  |
Repurchase and retirement of shares (in Shares) | (73,300) |  | (79,392) |  |
Repurchase and retirement of shares | (90,159) |  | (95,033) |  |
Additional Paid-in Capital [Member] |  |  |  |  |
Note 11 - Stockholders's Equity (Details) - Stockholders’ Equity Transactions [Line Items] |  |  |  |  |
Common stock, amount | 29,138,165 |  | 28,632,311 |  |
Common stock, amount | 28,883,823 |  | 28,883,823 |  |
Exercise of stock options, amount | (217,154) |  | 179,778 |  |
Repurchase and retirement of shares | (1,009,412) |  | (1,086,824) |  |
Stock-based compensation | 230,712 |  | 417,046 |  |
Income tax effect related to stock options exercised | 741,512 |  | 741,512 |  |
Retained Earnings [Member] |  |  |  |  |
Note 11 - Stockholders's Equity (Details) - Stockholders’ Equity Transactions [Line Items] |  |  |  |  |
Common stock, amount | (11,505,358) |  | (13,329,379) |  |
Common stock, amount | (8,814,453) |  | (8,814,453) |  |
Net income for the period | 2,690,905 |  | 4,514,926 |  |
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |  |
Note 11 - Stockholders's Equity (Details) - Stockholders’ Equity Transactions [Line Items] |  |  |  |  |
Common stock, amount | (30,171) |  | (244,981) |  |
Common stock, amount | (409,989) |  | (409,989) |  |
Unrealized loss on foreign currency forward contracts treated as hedges | (437,519) |  | (602,901) |  |
Reclassification to net income due to settlement of foreign currency forward contracts treated as hedges | $ 57,701 |  | $ 437,893 |  |

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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: 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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