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Note 6 - Inventories (Details) - Inventories (USD $)
Dec. 31, 2014
Dec. 31, 2013
Inventories [Abstract]    
Raw materials $ 6,161,363us-gaap_InventoryRawMaterialsNetOfReserves $ 5,926,030us-gaap_InventoryRawMaterialsNetOfReserves
Work-in-process 3,041,227us-gaap_InventoryWorkInProcessNetOfReserves 2,308,233us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 3,204,186us-gaap_InventoryFinishedGoodsNetOfReserves 2,762,522us-gaap_InventoryFinishedGoodsNetOfReserves
Total $ 12,406,776us-gaap_InventoryNet $ 10,996,785us-gaap_InventoryNet