Note 2 - Computation of Net Income (Loss) Per Share - Computation of Basic and Diluted Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2016	Oct. 31, 2015
Common Class A [Member]
Net (loss) income	$ 1,311	$ 2,208	$ (245)	$ 4,067
Less: Dividends declared	(1,136)	(1,121)	(3,393)	(3,346)
Undistributed net income (loss)	175	1,087	(3,638)	721
Net (loss) income per share – Common Stock
Dividends declared	1,136	1,121	3,393	3,346
Allocation of undistributed net income (loss)	175	1,087	(3,638)	721
Net (loss) income	$ 1,311	$ 2,208	$ (245)	$ 4,067
Weighted average shares of common stock outstanding—basic (in shares)	15,773	15,559	15,687	15,431
Weighted average potential shares of common stock (in shares)	829	749		777
Weighted average shares of common stock and potential common shares outstanding—diluted (in shares)	16,602	16,308	15,687	16,208
Basic net (loss) income per share (in dollars per share)	$ 0.08	$ 0.14	$ (0.02)	$ 0.26
Diluted net (loss) income per share (in dollars per share)	$ 0.08	$ 0.14	$ (0.02)	$ 0.25
Common Class B [Member]
Net (loss) income	$ 222	$ 378	$ (46)	$ 699
Less: Dividends declared	(192)	(192)	(577)	(576)
Undistributed net income (loss)	30	186	(623)	123
Net (loss) income per share – Common Stock
Dividends declared	192	192	577	576
Allocation of undistributed net income (loss)	30	186	(623)	123
Net (loss) income	$ 222	$ 378	$ (46)	$ 699
Weighted average shares of common stock outstanding—basic (in shares)	3,206	3,203	3,205	3,200
Weighted average potential shares of common stock (in shares)	95	83		83
Weighted average shares of common stock and potential common shares outstanding—diluted (in shares)	3,301	3,286	3,205	3,283
Basic net (loss) income per share (in dollars per share)	$ 0.07	$ 0.12	$ (0.01)	$ 0.22
Diluted net (loss) income per share (in dollars per share)	$ 0.07	$ 0.12	$ (0.01)	$ 0.21
Net (loss) income	$ 1,533	$ 2,586	$ (291)	$ 4,766
Less: Dividends declared	(1,328)	(1,313)	(3,970)	(3,922)
Undistributed net income (loss)	205	1,273	(4,261)	844
Dividends declared	1,328	1,313	3,970	3,922
Allocation of undistributed net income (loss)	205	1,273	(4,261)	844
Net (loss) income	$ 1,533	$ 2,586	$ (291)	$ 4,766