Segment Reporting (Details) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2013	Jan. 31, 2013
Financial information by business segment
Total Assets	$ 190,835	$ 190,407
Equipment Leasing [Member]
Financial information by business segment
Total Assets	173,642	171,971
Seamap [Member]
Financial information by business segment
Total Assets	17,284	18,578
Eliminations [Member]
Financial information by business segment
Total Assets	$ (91)	$ (142)