Stock-Based Compensation and Stockholders' Rights (Restricted Stock Units) (Details) (USD $)	12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
Restricted Stock or Stock Units [Member]
Summary of restricted stock and stock unit awards
Granted	669,375	68,960	56,455
Expense for 12 months ended	$ 698,000	$ 735,000	$ 799,000
Unrecognized compensation at cost	1,080,000
Restricted Stock Units
Beginning balance	290,960	467,455	589,854
Granted	669,375	68,960	56,455
Vested	(204,960)	(178,455)	(178,854)
Forfeited	(12,000)	(67,000)	0
Ending balance	743,375	290,960	467,455
Weighted- average fair value of restricted stock units
Beginning balance	$ 3.80	$ 4.19	$ 4.38
Granted	$ 1.62	$ 2.89	$ 3.10
Vested	$ 3.63	$ 4.29	$ 4.47
Forfeited	$ 3.50	$ 4.31
Ending balance	$ 1.89	$ 3.80	$ 4.19
Aggregate fair value of stock awards vested during the period	744,000	766,000	799,000
2011 Plan [Member] | Grants of Restricted Stock, issued 6/19/2012, vesting over 1 year [Member]
Summary of restricted stock and stock unit awards
Granted	31,250
Maximum term of stock options	1 year
Expense for 12 months ended	33,000	0	0
Unrecognized compensation at cost	17,000
Restricted Stock Units
Granted	31,250
2011 Plan [Member] | 520,000 Grants of Restricted Stock, issued 6/19/2012, vesting over 5 years [Member]
Summary of restricted stock and stock unit awards
Granted	520,000
Maximum term of stock options	5 years
Expense for 12 months ended	111,000	0	0
Unrecognized compensation at cost	721,000
Restricted Stock Units
Granted	520,000
2011 Plan [Member] | Restricted Stock or Stock Units [Member]
Summary of restricted stock and stock unit awards
Granted	551,250
Restricted Stock Units
Granted	551,250
2007 Plan [Member] | Grants of Restricted Stock, issued 6/19/2012, vesting over 1 year [Member]
Summary of restricted stock and stock unit awards
Granted	78,125
Maximum term of stock options	1 year
Expense for 12 months ended	82,000	0	0
Unrecognized compensation at cost	41,000
Restricted Stock Units
Granted	78,125
2007 Plan [Member] | 40,000 Grants of Restricted Stock, issued 3/21/2012, vesting immediately [Member]
Summary of restricted stock and stock unit awards
Granted	40,000
Expense for 12 months ended	80,000	0	0
Unrecognized compensation at cost	0
Restricted Stock Units
Granted	40,000
2007 Plan [Member] | 68,960 Grants of Restricted Stock, issued 6/21/2011, vesting over 1 year [Member]
Summary of restricted stock and stock unit awards
Granted	68,960
Maximum term of stock options	1 year
Expense for 12 months ended	67,000	133,000	0
Unrecognized compensation at cost	0
Restricted Stock Units
Granted	68,960
2007 Plan [Member] | 56,455 Grants of Restricted Stock, issued 6/8/2010, vesting over 1 year [Member]
Summary of restricted stock and stock unit awards
Granted	56,455
Maximum term of stock options	1 year
Expense for 12 months ended	0	58,000	116,000
Unrecognized compensation at cost	0
Restricted Stock Units
Granted	56,455
2007 Plan [Member] | 382,500 Restricted Stock Units, issued 6/16/2009, vesting over 5 years [Member]
Summary of restricted stock and stock unit awards
Granted	382,500
Maximum term of stock options	5 years
Expense for 12 months ended	226,000	235,000	268,000
Unrecognized compensation at cost	301,000
Restricted Stock Units
Granted	382,500
2007 Plan [Member] | 49,854 Restricted Stock Units, issued 6/16/2009, vesting over 1 year [Member]
Summary of restricted stock and stock unit awards
Granted	49,854
Maximum term of stock options	1 year
Expense for 12 months ended	0	0	58,000
Unrecognized compensation at cost	0
Restricted Stock Units
Granted	49,854
2007 Plan [Member] | 262,500 Restricted Stock Units, issued 6/19/2007, vesting over 5 years [Member]
Summary of restricted stock and stock unit awards
Granted	262,500
Maximum term of stock options	5 years
Expense for 12 months ended	99,000	309,000	357,000
Unrecognized compensation at cost	$ 0
Restricted Stock Units
Granted	262,500
2007 Plan [Member] | Restricted Stock or Stock Units [Member]
Summary of restricted stock and stock unit awards
Granted	118,125
Restricted Stock Units
Granted	118,125