Unaudited Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]
Beginning balance at Feb. 28, 2018	$ 261,704	$ 75,134	$ 121,333	$ 164,177	$ (16,428)	$ (82,512)
Beginning balance common stock, shares at Feb. 28, 2018		30,053,443
Beginning balance, treasury stock, shares at Feb. 28, 2018						(4,789,228)
Net earnings	29,233			29,233
Adjustment to pension, net of deferred tax	755				755
Dividends paid	(16,733)			(16,733)
Stock based compensation	1,036		1,036
Exercise of stock options and restricted stock	69		(1,528)			$ 1,597
Exercise of stock options and restricted stock, shares						110,139
Common stock issued for acquisition of business	16,218		1,874			$ 14,344
Common stock issued for acquisition of business, shares						829,126
Common stock repurchases	(4,560)					$ (4,560)
Common stock repurchases, shares						(234,823)
Ending balance at Nov. 30, 2018	287,722	$ 75,134	122,715	176,677	(15,673)	$ (71,131)
Ending balance common stock, shares at Nov. 30, 2018		30,053,443
Ending balance treasury stock, shares at Nov. 30, 2018						(4,084,786)
Beginning balance at Aug. 31, 2018	286,496	$ 75,134	122,353	172,180	(15,920)	$ (67,251)
Beginning balance common stock, shares at Aug. 31, 2018		30,053,443
Beginning balance, treasury stock, shares at Aug. 31, 2018						(3,887,906)
Net earnings	10,419			10,419
Adjustment to pension, net of deferred tax	247				247
Dividends paid	(5,922)			(5,922)
Stock based compensation	362		362
Common stock repurchases	(3,880)					$ (3,880)
Common stock repurchases, shares						(196,880)
Ending balance at Nov. 30, 2018	287,722	$ 75,134	122,715	176,677	(15,673)	$ (71,131)
Ending balance common stock, shares at Nov. 30, 2018		30,053,443
Ending balance treasury stock, shares at Nov. 30, 2018						(4,084,786)
Beginning balance at Feb. 28, 2019	$ 289,127	$ 75,134	123,065	179,003	(16,704)	$ (71,371)
Beginning balance common stock, shares at Feb. 28, 2019	30,053,443	30,053,443
Beginning balance, treasury stock, shares at Feb. 28, 2019						(4,097,099)
Net earnings	$ 29,718			29,718
Adjustment to pension, net of deferred tax	677				677
Dividends paid	(17,622)			(17,622)
Stock based compensation	1,018		1,018
Exercise of stock options and restricted stock			(1,382)			$ 1,382
Exercise of stock options and restricted stock, shares						87,143
Common stock repurchases	$ (2,471)					$ (2,471)
Common stock repurchases, shares	(126,330)					(126,330)
Ending balance at Nov. 30, 2019	$ 300,447	$ 75,134	122,701	191,099	(16,027)	$ (72,460)
Ending balance common stock, shares at Nov. 30, 2019	30,053,443	30,053,443
Ending balance treasury stock, shares at Nov. 30, 2019						(4,136,286)
Beginning balance at Aug. 31, 2019	$ 296,017	$ 75,134	122,359	186,417	(16,248)	$ (71,645)
Beginning balance common stock, shares at Aug. 31, 2019		30,053,443
Beginning balance, treasury stock, shares at Aug. 31, 2019						(4,094,674)
Net earnings	10,553			10,553
Adjustment to pension, net of deferred tax	221				221
Dividends paid	(5,871)			(5,871)
Stock based compensation	353		353
Exercise of stock options and restricted stock			(11)			$ 11
Exercise of stock options and restricted stock, shares						667
Common stock repurchases	(826)					$ (826)
Common stock repurchases, shares						(42,279)
Ending balance at Nov. 30, 2019	$ 300,447	$ 75,134	$ 122,701	$ 191,099	$ (16,027)	$ (72,460)
Ending balance common stock, shares at Nov. 30, 2019	30,053,443	30,053,443
Ending balance treasury stock, shares at Nov. 30, 2019						(4,136,286)