Note 2 - Computation of Basic and Diluted Net (Loss) Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Common Class A [Member]
Net (loss) income	$ 513	$ 1,392	$ (1,829)	$ 1,860
Less: Dividends declared	(1,134)	(1,118)	(2,257)	(2,225)
Undistributed net (loss) income	(621)	274	(4,086)	(365)
Net (loss) income per share – Common Stock
Dividends declared	1,134	1,118	2,257	2,225
Allocation of undistributed net (loss) income	(621)	274	(4,086)	(365)
Net (loss) income	$ 513	$ 1,392	$ (1,829)	$ 1,860
Weighted average shares of common stock outstanding—basic (in shares)	15,694	15,467	15,644	15,367
Weighted average potential shares of common stock (in shares)	586	794		793
Weighted average shares of common stock and potential common shares outstanding—diluted (in shares)	16,280	16,261	15,644	16,160
Basic net (loss) income per share (in dollars per share)	$ 0.03	$ 0.09	$ (0.12)	$ 0.12
Diluted net (loss) income per share (in dollars per share)	$ 0.03	$ 0.09	$ (0.12)	$ 0.12
Common Class B [Member]
Net (loss) income	$ 87	$ 239	$ (313)	$ 320
Less: Dividends declared	(192)	(192)	(385)	(384)
Undistributed net (loss) income	(105)	47	(698)	(64)
Net (loss) income per share – Common Stock
Dividends declared	192	192	385	384
Allocation of undistributed net (loss) income	(105)	47	(698)	(64)
Net (loss) income	$ 87	$ 239	$ (313)	$ 320
Weighted average shares of common stock outstanding—basic (in shares)	3,205	3,201	3,204	3,198
Weighted average potential shares of common stock (in shares)	70	83		84
Weighted average shares of common stock and potential common shares outstanding—diluted (in shares)	3,275	3,284	3,204	3,282
Basic net (loss) income per share (in dollars per share)	$ 0.03	$ 0.08	$ (0.10)	$ 0.10
Diluted net (loss) income per share (in dollars per share)	$ 0.03	$ 0.07	$ (0.10)	$ 0.10
Net (loss) income	$ 600	$ 1,631	$ (2,142)	$ 2,180
Less: Dividends declared	(1,326)	(1,310)	(2,642)	(2,609)
Undistributed net (loss) income	(726)	321	(4,784)	(429)
Dividends declared	1,326	1,310	2,642	2,609
Allocation of undistributed net (loss) income	(726)	321	(4,784)	(429)
Net (loss) income	$ 600	$ 1,631	$ (2,142)	$ 2,180