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Note 14 - Stockholders' Equity (Details) - Stockholders' Equity Transactions - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Note 14 - Stockholders' Equity (Details) - Stockholders' Equity Transactions [Line Items] |  |  |  |
Balance | $ 34,222,427 |  | $ 34,222,427 |
Exercise of stock options | $ 299,472 |  | $ 547,455 |
Exercise of stock options (in Shares) | 112,656 | 48,108 | 187,653 | 340,021
Repurchase and retirement of shares | $ (489,536) |  | $ (8,201,681) |
Repurchase and retirement of shares (in Shares) |  | 0 |  |
Stock-based compensation | 124,605 |  | 249,653 |
Income tax effect related to stock options exercised | 676,060 |  | 1,088,702 |
Net income for the period | 2,284,995 | $ 1,347,182 | 5,118,938 | $ 1,824,021
Increase to reflect the present value of Redeemable non-controlling interest | (12,150) |  | (12,150) |
Unrealized loss on foreign currency forward contracts treated as hedges | (38,046) |  | (998,912) |
Reclassification to net income due to settlement of foreign currency forward contracts treated as hedges | 371,955 | $ 145,141 | 788,029 | $ 380,192
Common Stock [Member] |  |  |  |
Note 14 - Stockholders' Equity (Details) - Stockholders' Equity Transactions [Line Items] |  |  |  |
Balance | $ 14,411,616 |  | $ 14,411,616 |
Balance (in Shares) | 11,083,976 |  | 11,083,976 |
Exercise of stock options | $ 469,394 |  | $ 830,343 |
Exercise of stock options (in Shares) | 112,656 |  | 187,653 |
Repurchase and retirement of shares | $ (32,783) |  | $ (548,786) |
Repurchase and retirement of shares (in Shares) | (25,413) |  | (433,409) |
Additional Paid-in Capital [Member] |  |  |  |
Note 14 - Stockholders' Equity (Details) - Stockholders' Equity Transactions [Line Items] |  |  |  |
Balance | $ 22,492,630 |  | $ 22,492,630 |
Exercise of stock options | (169,922) |  | (282,888) |
Repurchase and retirement of shares | (456,753) |  | (7,652,895) |
Stock-based compensation | 124,605 |  | 249,653 |
Income tax effect related to stock options exercised | 676,060 |  | 1,088,702 |
Retained Earnings [Member] |  |  |  |
Note 14 - Stockholders' Equity (Details) - Stockholders' Equity Transactions [Line Items] |  |  |  |
Balance | (1,848,495) |  | (1,848,495) |
Net income for the period | 2,284,995 |  | 5,118,938 |
Increase to reflect the present value of Redeemable non-controlling interest | (12,150) |  | (12,150) |
AOCI Attributable to Parent [Member] |  |  |  |
Note 14 - Stockholders' Equity (Details) - Stockholders' Equity Transactions [Line Items] |  |  |  |
Balance | (833,324) |  | (833,324) |
Unrealized loss on foreign currency forward contracts treated as hedges | (38,046) |  | (998,912) |
Reclassification to net income due to settlement of foreign currency forward contracts treated as hedges | $ 371,955 |  | $ 788,029 |

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