CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive (Loss) Gain	Non-controlling Interests	Total
Balances at Jan. 31, 2018	$ 2,336	$ 143,215	$ 211,112	$ 1,422	$ 43	$ 358,128
Balances (in shares) at Jan. 31, 2018	15,567,719
Adoption of ASC Topic 606 (Note 1)			37			37
Net (loss) income			54,243		(83)	54,160
Foreign currency translation gain (loss)				(2,364)		(2,364)
Stock compensation expense		1,244				1,244
Stock option exercises		48				$ 48
Stock option exercises (in shares)	3,000					3,000
Cash dividends			(11,676)			$ (11,676)
Distributions to joint venture partners					(72)	(72)
Balances at Oct. 31, 2018	$ 2,336	144,507	253,716	(942)	(112)	399,505
Balances (in shares) at Oct. 31, 2018	15,570,719
Balances at Jul. 31, 2018	$ 2,336	144,135	225,174	150	20	371,815
Balances (in shares) at Jul. 31, 2018	15,568,719
Net (loss) income			32,434		(60)	32,374
Foreign currency translation gain (loss)				(1,092)		(1,092)
Stock compensation expense		338				338
Stock option exercises		34				34
Stock option exercises (in shares)	2,000
Cash dividends			(3,892)			(3,892)
Distributions to joint venture partners					(72)	(72)
Balances at Oct. 31, 2018	$ 2,336	144,507	253,716	(942)	(112)	399,505
Balances (in shares) at Oct. 31, 2018	15,570,719
Balances at Jan. 31, 2019	$ 2,337	144,961	247,616	(346)	(196)	394,372
Balances (in shares) at Jan. 31, 2019	15,573,869
Net (loss) income			(35,501)		2,007	(33,494)
Foreign currency translation gain (loss)				(825)		(825)
Stock compensation expense		1,512				1,512
Stock option exercises	$ 9	1,558				$ 1,567
Stock option exercises (in shares)	59,433					59,000
Cash dividends			(11,714)			$ (11,714)
Balances at Oct. 31, 2019	$ 2,346	148,031	200,401	(1,171)	1,811	351,418
Balances (in shares) at Oct. 31, 2019	15,633,302
Balances at Jul. 31, 2019	$ 2,346	147,445	211,167	(1,406)	(483)	359,069
Balances (in shares) at Jul. 31, 2019	15,633,302
Net (loss) income			(6,855)		2,294	(4,561)
Foreign currency translation gain (loss)				235		235
Stock compensation expense		586				586
Cash dividends			(3,911)			(3,911)
Balances at Oct. 31, 2019	$ 2,346	$ 148,031	$ 200,401	$ (1,171)	$ 1,811	$ 351,418
Balances (in shares) at Oct. 31, 2019	15,633,302