Note 12 - Equity Incentive Plans and Employee Benefits - Stock Option Activities and Balances of Stock Option Plans (Details) - USD ($)	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015	Feb. 01, 2014	Jan. 28, 2017	Jan. 30, 2016
Options Outstanding (in shares)	2,933,671	3,768,058	4,094,621
Options Outstanding (in dollars per share)	$ 11.57	$ 10.86	$ 11.24
Options Outstanding (Year)	4 years 182 days	4 years 73 days	4 years 328 days	4 years 292 days
Granted (in shares)	483,400	104,200	467,400
Granted (in dollars per share)	$ 6.87	$ 8.74	$ 4.54
Cancelled (in shares)	(556,616)	(415,146)	(734,702)
Cancelled (in dollars per share)	$ 11.41	$ 10.39	$ 9.52
Exercised (in shares)	(194,884)	(523,441)	(59,261)
Exercised (in dollars per share)	$ 4.75	$ 6.83	$ 4.59
Options Outstanding (in shares)	2,933,671	3,768,058	4,094,621	4,094,621	2,665,571	2,933,671
Options Outstanding (in dollars per share)	$ 11.57	$ 10.86	$ 11.24		$ 11.25	$ 11.57
Options Outstanding (in shares)	2,665,571	2,933,671	3,768,058	4,094,621
Aggregate Intrinsic Value					$ 566,742
Ending vested and expected to vest (in shares)					2,621,451
Ending vested and expected to vest (in dollars per share)					$ 11.33
Ending vested and expected to vest (Year)	4 years 146 days
Ending vested and expected to vest					$ 565,667
Ending exercisable (in shares)					2,131,470
Ending exercisable (in dollars per share)					$ 12.35
Ending exercisable (Year)	3 years 109 days
Ending exercisable					$ 513,643