Balance Sheet (Details) (USD $)	Apr. 30, 2013	Jan. 31, 2013
Accounts receivable:
Accounts receivable	$ 31,779,000	$ 26,505,000
Allowance for doubtful accounts	(3,363,000)	(3,374,000)
Total accounts receivable, net	28,416,000	23,131,000
Contracts and notes receivable:
Contracts receivable	838,000	904,000
Notes receivable	849,000	1,471,000
Less current portion	(1,638,000)	(2,096,000)
Long-term portion	$ 49,000	$ 279,000