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Note 4 - Property and equipment (Details) - Depreciation of Property and Equipment (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Depreciation of Property and Equipment (Incomplete) [Abstract]      
Depreciation of property and equipment $ 926,102us-gaap_Depreciation $ 843,420us-gaap_Depreciation $ 802,060us-gaap_Depreciation