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Note 6 - Inventories (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Raw materials $ 7,424,000us-gaap_InventoryRawMaterialsNetOfReserves $ 6,436,000us-gaap_InventoryRawMaterialsNetOfReserves
Work in process 5,299,000us-gaap_InventoryWorkInProcessNetOfReserves 4,834,000us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 6,394,000us-gaap_InventoryFinishedGoodsNetOfReserves 5,274,000us-gaap_InventoryFinishedGoodsNetOfReserves
$ 19,117,000us-gaap_InventoryNet $ 16,544,000us-gaap_InventoryNet [1]
[1] The condensed consolidated balance sheet as of December 31, 2014 has been prepared using information from the audited consolidated balance sheet as of that date.