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Note 7 - Inventories (Details) - Inventories (USD $)
Mar. 31, 2015
Dec. 31, 2014
Inventories [Abstract]    
Raw materials $ 6,470,239us-gaap_InventoryRawMaterialsNetOfReserves $ 6,161,363us-gaap_InventoryRawMaterialsNetOfReserves
Work-in-process 2,911,794us-gaap_InventoryWorkInProcessNetOfReserves 3,041,227us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 3,133,754us-gaap_InventoryFinishedGoodsNetOfReserves 3,204,186us-gaap_InventoryFinishedGoodsNetOfReserves
Total $ 12,515,787us-gaap_InventoryNet $ 12,406,776us-gaap_InventoryNet