INVENTORIES (Details) (USD $)	Jan. 31, 2013	Jan. 31, 2012
INVENTORIES [Abstract]
Raw materials	$ 13,262,612	$ 12,673,210
Work in process	2,966,664	2,808,747
Finished goods	1,641,444	2,365,186
Inventories, net	17,870,720	17,847,143
Inventory valued using LIFO	2,367,256	1,790,705
Difference between LIFO value and replacement cost	1,599,392	1,553,153
Inventory value over tax basis of inventory	$ 867,107	$ 866,900