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	9,247			9,247
Adjustment to pension, net of deferred tax	261				261
Dividends paid	(5,083)			(5,083)
Stock based compensation	327		327
Exercise of stock options and restricted stock			(1,390)			$ 1,390
Exercise of stock options and restricted stock, shares						80,692
Common stock repurchases	(680)					$ (680)
Common stock repurchases, shares						(37,943)
Ending balance at May. 31, 2018	265,776	$ 75,134	120,270	168,341	(16,167)	$ (81,802)
Ending balance common stock, shares at May. 31, 2018		30,053,443
Ending balance treasury stock, shares at May. 31, 2018						(4,746,479)
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	18,814
Adjustment to pension, net of deferred tax	508
Ending balance at Aug. 31, 2018	286,496	$ 75,134	122,353	172,180	(15,920)	$ (67,251)
Ending balance common stock, shares at Aug. 31, 2018		30,053,443
Ending balance treasury stock, shares at Aug. 31, 2018						(3,887,906)
Beginning balance at May. 31, 2018	265,776	$ 75,134	120,270	168,341	(16,167)	$ (81,802)
Beginning balance common stock, shares at May. 31, 2018		30,053,443
Beginning balance, treasury stock, shares at May. 31, 2018						(4,746,479)
Net earnings	9,567			9,567
Adjustment to pension, net of deferred tax	247				247
Dividends paid	(5,728)			(5,728)
Stock based compensation	347		347
Exercise of stock options and restricted stock	69		(138)			$ 207
Exercise of stock options and restricted stock, shares						29,447
Common stock issued for acquisition of business	16,218		1,874			$ 14,344
Common stock issued for acquisition of business, shares						829,126
Ending balance at Aug. 31, 2018	286,496	$ 75,134	122,353	172,180	(15,920)	$ (67,251)
Ending balance common stock, shares at Aug. 31, 2018		30,053,443
Ending balance treasury stock, shares at Aug. 31, 2018						(3,887,906)
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	$ 9,632			9,632
Adjustment to pension, net of deferred tax	234				234
Dividends paid	(5,875)			(5,875)
Stock based compensation	358		358
Exercise of stock options and restricted stock			(1,312)			$ 1,312
Exercise of stock options and restricted stock, shares						83,095
Common stock repurchases	(1,212)					$ (1,212)
Common stock repurchases, shares						(62,038)
Ending balance at May. 31, 2019	292,264	$ 75,134	122,111	182,760	(16,470)	$ (71,271)
Ending balance common stock, shares at May. 31, 2019		30,053,443
Ending balance treasury stock, shares at May. 31, 2019						(4,076,042)
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	$ 19,165
Adjustment to pension, net of deferred tax	$ 456
Common stock repurchases, shares	(84,051)
Ending balance at Aug. 31, 2019	$ 296,017	$ 75,134	122,359	186,417	(16,248)	$ (71,645)
Ending balance common stock, shares at Aug. 31, 2019	30,053,443	30,053,443
Ending balance treasury stock, shares at Aug. 31, 2019						(4,094,674)
Beginning balance at May. 31, 2019	$ 292,264	$ 75,134	122,111	182,760	(16,470)	$ (71,271)
Beginning balance common stock, shares at May. 31, 2019		30,053,443
Beginning balance, treasury stock, shares at May. 31, 2019						(4,076,042)
Net earnings	9,533			9,533
Adjustment to pension, net of deferred tax	222				222
Dividends paid	(5,876)			(5,876)
Stock based compensation	307		307
Exercise of stock options and restricted stock			(59)			$ 59
Exercise of stock options and restricted stock, shares						3,381
Common stock repurchases	(433)					$ (433)
Common stock repurchases, shares						(22,013)
Ending balance at Aug. 31, 2019	$ 296,017	$ 75,134	$ 122,359	$ 186,417	$ (16,248)	$ (71,645)
Ending balance common stock, shares at Aug. 31, 2019	30,053,443	30,053,443
Ending balance treasury stock, shares at Aug. 31, 2019						(4,094,674)