Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	$1 Par Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	redeemable noncontrolling interest [Member]
Balance at beginning of period at Jan. 31, 2020	$ 314,646	$ 67,436	$ 61,508	$ (111,183)	$ 302,300	$ (5,415)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	9,866				9,866
Other comprehensive income (loss):
Cumulative foreign currency translation adjustment	(711)					(711)
Postretirement benefits reclassified from accumulated other comprehensive income (loss) after tax (expense) benefit	(5)					(5)
Reclassification and Redeption of Noncontrolling Interest (see Note 1)	215		215
Cash dividends	(9,318)		183		(9,501)
Shares issued on stock options exercised, net of shares withheld for employee taxes	(113)	11	(124)
Shares issued on vesting of stock units, net of shares withheld for employee taxes	(638)	54	(692)
Director shares issued	0	9	(9)
Share-based compensation	3,609		3,609
Balance at end of period at Jul. 31, 2020	$ 317,551	67,510	64,690	(111,183)	302,665	(6,131)
Other comprehensive income (loss):
Common Stock, Dividends, Per Share, Declared	$ 0.26
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	$ 2
Temporary Equity, Carrying Amount, Beginning Balance at Jan. 31, 2020							$ 21,302
Increase (Decrease) in Temporary Equity [Roll Forward]
Net (Loss)							(98)
Recalassification and Redemption of Noncontrolling Interest (see Note 1)							(21,204)
Temporary Equity, Carrying Amount, Ending Balance at Jul. 31, 2020							0
Balance at beginning of period at Apr. 30, 2020	312,424	67,500	62,505	(111,183)	301,599	(7,997)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	5,819				5,819
Other comprehensive income (loss):
Cumulative foreign currency translation adjustment	1,868					1,868
Postretirement benefits reclassified from accumulated other comprehensive income (loss) after tax (expense) benefit	(2)					(2)
Cash dividends	(4,660)		93		(4,753)
Shares issued on vesting of stock units, net of shares withheld for employee taxes	(11)	1	(12)
Director shares issued	0	9	(9)
Share-based compensation	2,113		2,113
Balance at end of period at Jul. 31, 2020	$ 317,551	67,510	64,690	(111,183)	302,665	(6,131)
Other comprehensive income (loss):
Common Stock, Dividends, Per Share, Declared	$ 0.13
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	$ 1
Temporary Equity, Carrying Amount, Beginning Balance at Apr. 30, 2020							0
Increase (Decrease) in Temporary Equity [Roll Forward]
Net (Loss)							0
Temporary Equity, Carrying Amount, Ending Balance at Jul. 31, 2020							$ 0
Balance at beginning of period at Jan. 31, 2021	331,355	67,533	66,670	(111,183)	311,676	(3,341)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	16,473				16,473
Other comprehensive income (loss):
Cumulative foreign currency translation adjustment	1,366					1,366
Postretirement benefits reclassified from accumulated other comprehensive income (loss) after tax (expense) benefit	40					40
Shares issued on stock options exercised, net of shares withheld for employee taxes	(41)	1	(42)
Shares issued on vesting of stock units, net of shares withheld for employee taxes	(1,047)	49	(1,096)
Share-based compensation	4,378
Balance at end of period at Jul. 31, 2021	352,524	67,583	69,910	(111,183)	328,149	(1,935)
Other comprehensive income (loss):
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	(11)
Balance at beginning of period at Apr. 30, 2021	343,985	67,583	67,266	(111,183)	321,296	(977)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	6,853				6,853
Other comprehensive income (loss):
Cumulative foreign currency translation adjustment	(978)					(978)
Postretirement benefits reclassified from accumulated other comprehensive income (loss) after tax (expense) benefit	20					20
Share-based compensation	2,644		2,644
Balance at end of period at Jul. 31, 2021	352,524	$ 67,583	$ 69,910	$ (111,183)	$ 328,149	$ (1,935)
Other comprehensive income (loss):
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	$ (6)