Stock-Based Compensation and Stockholders' Rights (Restricted Stock Units) (Details) - USD ($)	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Weighted- average fair value of restricted stock units
Aggregate fair value of stock awards vested during the period	$ 1,260,000	$ 902,000	$ 593,000
Restricted Stock or Stock Units [Member]
Summary of restricted stock and stock unit awards
Granted	504,404	87,284	75,174
Expense for 12 months ended	$ 830,000	$ 609,000	$ 493,000
Unrecognized compensation at cost	$ 2,332,000
Restricted Stock Units
Outstanding at beginning of year	491,284	657,174	812,626
Granted	504,404	87,284	75,174
Vested	(259,284)	(223,174)	(212,626)
Forfeited	(44,000)	(30,000)	(18,000)
Outstanding at end of year	692,404	491,284	657,174
Weighted- average fair value of restricted stock units
Outstanding at beginning of year	$ 2.46	$ 2.34	$ 2.24
Granted	4.95	3.89	2.76
Vested	4.86	4.04	2.79
Forfeited	4.42	2.61	2.74
Outstanding at end of year	$ 4.25	$ 2.46	$ 2.34
2011 Plan [Member] | 40,404 Restricted Stock Units, issued 6/20/2017, vesting over 1 year [Member]
Summary of restricted stock and stock unit awards
Granted	40,404
Maximum term of stock options		1 year
Expense for 12 months ended	$ 133,000	$ 0	$ 0
Unrecognized compensation at cost	$ 67,000
Restricted Stock Units
Granted	40,404
2011 Plan [Member] | 464,000 Restricted Stock Units, issued on 6/20/2017 vesting over 5 years [Member]
Summary of restricted stock and stock unit awards
Granted	464,000
Maximum term of stock options		5 years
Expense for 12 months ended	$ 292,000	$ 0	0
Unrecognized compensation at cost	$ 1,901,000
Restricted Stock Units
Granted	464,000
2011 Plan [Member] | 51,284 Restricted Stock Units, issued 6/21/2016, vesting over 1 years [Member]
Summary of restricted stock and stock unit awards
Granted	51,284
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	51,284
2011 Plan [Member] | 36,000 Restricted Stock Units, issued 6/21/2016, vesting over 3 years [Member]
Summary of restricted stock and stock unit awards
Granted	36,000
Maximum term of stock options		3 years
Expense for 12 months ended	$ 16,000	$ 32,000	0
Unrecognized compensation at cost	$ 0
Restricted Stock Units
Granted	36,000
2011 Plan [Member] | 48,000 Restricted Stock Units, issued 6/22/2015, vesting over 4 years [Member]
Summary of restricted stock and stock unit awards
Granted	48,000
Maximum term of stock options		4 years
Expense for 12 months ended	$ 33,000	$ 32,000	22,000
Unrecognized compensation at cost	$ 44,000
Restricted Stock Units
Granted	48,000
2011 Plan [Member] | 27,124 Restricted Stock Units, issued 6/22/2015, vesting over 1 years [Member]
Summary of restricted stock and stock unit awards
Granted	27,174
Maximum term of stock options		1 year
Expense for 12 months ended	$ 0	$ 25,000	50,000
Unrecognized compensation at cost	$ 0
Restricted Stock Units
Granted	27,174
2011 Plan [Member] | 490,000 units of restricted stock issued on 6/24/2014 vesting over 5 years [Member]
Summary of restricted stock and stock unit awards
Granted	490,000
Maximum term of stock options	5 years
Expense for 12 months ended	$ 240,000	$ 240,000	246,000
Unrecognized compensation at cost	$ 320,000
Restricted Stock Units
Granted	490,000
2011 Plan [Member] | 28,626 Restricted Stock Units, issued 6/24/2014, vesting over 5 years [Member]
Summary of restricted stock and stock unit awards
Granted	28,626
Maximum term of stock options		5 years
Expense for 12 months ended	$ 0	$ 0	25,000
Unrecognized compensation at cost	$ 0
Restricted Stock Units
Granted	28,626
2011 Plan [Member] | 520,000 Restricted Stock Units, 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	$ 49,000	$ 147,000	$ 150,000
Unrecognized compensation at cost	$ 0
Restricted Stock Units
Granted	520,000
2011 Plan [Member] | Restricted Stock or Stock Units [Member]
Summary of restricted stock and stock unit awards
Granted	504,404
Restricted Stock Units
Granted	504,404
2007 Plan [Member] | 382,500 Restricted Stock Units, issued 6/16/2009, Vesting over Five Years [Member]
Summary of restricted stock and stock unit awards
Maximum term of stock options		5 years