INVENTORIES (Details) (USD $)	3 Months Ended		6 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Mar. 31, 2013
INVENTORIES
Raw materials	$ 784,000		$ 784,000		$ 932,000
Work in process	330,000		330,000		330,000
Finished goods	3,085,000		3,085,000		2,164,000
Supplies	281,000		281,000		262,000
Inventories, net	4,480,000		4,480,000		3,688,000
Reserve for obsolescence	6,000		6,000		9,000
Abnormal production costs, charged to cost of sales	$ 0	$ 481,000	$ 0	$ 714,000