Consolidated Balance Sheets (Parenthetical) (USD $)	Jan. 31, 2014	Jan. 31, 2013
Property, plant and equipment, gross	$ 8,390,000	$ 13,230,000
Preferred stock, par value	$ 0.10	$ 0.10
Preferred stock, shares authorized	500,000	500,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.15	$ 0.15
Common stock, shares authorized	30,000,000	30,000,000
Common stock, shares issued	14,289,134	13,977,560
Common stock, shares outstanding	14,285,901	13,974,327
Treasury stock, shares	3,233	3,233
Construction Project Costs of Variable Interest Entities [Member]
Property, plant and equipment, gross		$ 5,309,000