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Note 14 - Stockholders' Equity (Details) - Stockholders' Equity Transactions - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Note 14 - Stockholders' Equity (Details) - Stockholders' Equity Transactions [Line Items]        
Balance $ 34,222,427   $ 35,642,393  
Exercise of stock options $ 189,913   $ 737,368  
Exercise of stock options (in Shares) 41,404 134,199 229,057 474,220
Repurchase and retirement of shares $ (9,977,495)   $ (18,179,176)  
Stock-based compensation 128,575   378,228  
Income tax effect related to stock options exercised 312,092   1,400,794  
Net income for the period 3,159,457 $ 2,690,905 8,278,395 $ 4,514,926
Increase to reflect the present value of Redeemable non-controlling interest (12,199)   (24,349)  
Unrealized loss on foreign currency forward contracts treated as hedges (724,336)   (1,723,248)  
Reclassification to net income due to settlement of foreign currency forward contracts treated as hedges 364,330 $ 57,701 1,152,359 $ 437,893
Balance 27,662,764   27,662,764  
Common Stock [Member]        
Note 14 - Stockholders' Equity (Details) - Stockholders' Equity Transactions [Line Items]        
Balance $ 14,411,616   $ 14,130,059  
Balance (in Shares) 11,083,976   11,329,732  
Exercise of stock options $ 272,269   $ 1,102,612  
Exercise of stock options (in Shares) 41,404   229,057  
Repurchase and retirement of shares $ (523,696)   $ (1,072,482)  
Repurchase and retirement of shares (in Shares) (398,000)   (831,409)  
Balance $ 14,160,189   $ 14,160,189  
Balance (in Shares) 10,727,380   10,727,380  
Additional Paid-in Capital [Member]        
Note 14 - Stockholders' Equity (Details) - Stockholders' Equity Transactions [Line Items]        
Balance $ 22,492,630   $ 29,090,058  
Exercise of stock options (82,356)   (365,244)  
Repurchase and retirement of shares (9,453,799)   (17,106,694)  
Stock-based compensation 128,575   378,228  
Income tax effect related to stock options exercised 312,092   1,400,794  
Balance 13,397,142   13,397,142  
Retained Earnings [Member]        
Note 14 - Stockholders' Equity (Details) - Stockholders' Equity Transactions [Line Items]        
Balance (1,848,495)   (6,955,283)  
Net income for the period 3,159,457   8,278,395  
Increase to reflect the present value of Redeemable non-controlling interest (12,199)   (24,349)  
Balance 1,298,763   1,298,763  
AOCI Attributable to Parent [Member]        
Note 14 - Stockholders' Equity (Details) - Stockholders' Equity Transactions [Line Items]        
Balance (833,324)   (622,441)  
Unrealized loss on foreign currency forward contracts treated as hedges (724,336)   (1,723,248)  
Reclassification to net income due to settlement of foreign currency forward contracts treated as hedges 364,330   1,152,359  
Balance $ (1,193,330)   $ (1,193,330)