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Note 3 - Inventories (Details) - Summary of Inventories (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Summary of Inventories [Abstract]
Raw materials	$ 10,366us-gaap_InventoryRawMaterials	$ 5,758us-gaap_InventoryRawMaterials
Work-in-process	530us-gaap_InventoryWorkInProcess	272us-gaap_InventoryWorkInProcess
Finished goods	1,913us-gaap_InventoryFinishedGoods	2,068us-gaap_InventoryFinishedGoods
Less reserve	(389)us-gaap_InventoryValuationReserves	(327)us-gaap_InventoryValuationReserves
	$ 12,420us-gaap_InventoryNet	$ 7,771us-gaap_InventoryNet

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

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