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
Net income (loss)			21,809		(23)	21,786
Foreign currency translation loss				(1,272)		(1,272)
Stock compensation expense		906				906
Exercise of stock options		14				$ 14
Exercise of stock options (in shares)	1,000					1,000
Cash dividends			(7,784)			$ (7,784)
Adoption of ASC Topic 606 (Note 1)			37			37
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
Balances at Apr. 30, 2018	$ 2,336	143,783	212,095	843	48	359,105
Balances (in shares) at Apr. 30, 2018	15,567,719
Net income (loss)			16,972		(28)	16,944
Foreign currency translation loss				(693)		(693)
Stock compensation expense		338				338
Exercise of stock options		14				14
Exercise of stock options (in shares)	1,000
Cash dividends			(3,893)			(3,893)
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
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 income (loss)			(28,646)		(287)	(28,933)
Foreign currency translation loss				(1,060)		(1,060)
Stock compensation expense		926				926
Exercise of stock options	$ 9	1,558				$ 1,567
Exercise of stock options (in shares)	59,433					59,000
Cash dividends			(7,803)			$ (7,803)
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	147,445,000	211,167,000	(1,406,000)	(483,000)	359,069,000
Balances at Apr. 30, 2019	$ 2,346	$ 146,932	$ 213,921	$ (1,400)	$ (309)	$ 361,490
Balances (in shares) at Apr. 30, 2019	15,633,302
Net income (loss)			1,154		(174)	980
Foreign currency translation loss				(6)		(6)
Stock compensation expense		513				513
Cash dividends			(3,908)			(3,908)
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	147,445,000	211,167,000	(1,406,000)	(483,000)	359,069,000