Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock	Treasury Stock	Additional Paid In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Redeemable Noncontrolling Interest	Total
Balance at Mar. 31, 2019	$ 330	$ (39,652)	$ 239,204	$ 250,279	$ (59,387)	$ 23,576	$ 390,774
Balance (in shares) at Mar. 31, 2019	30,012,775	(2,879,999)
Increase (Decrease) in Stockholders' Equity
Proceeds from the exercise of stock options			194			8	194
Proceeds from the exercise of stock options (in shares)	13,416
Restricted stock awards vested	$ 1		(1)
Restricted stock awards vested (in shares)	96,763
Restricted stock awards withheld for tax			(2,011)				(2,011)
Share-based compensation			6,674				6,674
Adjustments of redeemable noncontrolling interest to redemption value			18			170	18
Purchase of redeemable noncontrolling interest related to Polaris						(5,549)
Purchase of redeemable noncontrolling interest related to Polaris							5,549
Foreign currency translation on noncontrolling interest						116
Series A Convertible Preferred Stock dividends and accretion				(1,087)			(1,087)
Other comprehensive income (loss)					(1,194)	144	(1,194)
Net income				5,834			5,834
Net income						186	(186)
Balance at Jun. 30, 2019	$ 331	$ (39,652)	244,078	255,026	(60,581)	$ 18,651	399,202
Balance (in shares) at Jun. 30, 2019	30,122,954	(2,879,999)
Balance at Mar. 31, 2020	$ 335	$ (58,332)	246,862	293,831	(85,255)		$ 397,441
Balance (in shares) at Mar. 31, 2020	33,518,389	(3,385,564)					30,132,825
Increase (Decrease) in Stockholders' Equity
Proceeds from the exercise of stock options			92				$ 92
Proceeds from the exercise of stock options (in shares)	5,741
Restricted stock awards vested	$ 1		(1)
Restricted stock awards vested (in shares)	108,414
Restricted stock awards withheld for tax			(1,914)				(1,914)
Share-based compensation			3,592				3,592
Other comprehensive income (loss)					4,281		4,281
Series A Convertible Preferred Stock dividends and accretion				(1,087)			(1,087)
Net income				894			894
Balance at Jun. 30, 2020	$ 336	$ (58,332)	$ 248,631	$ 293,638	$ (80,974)		$ 403,299
Balance (in shares) at Jun. 30, 2020	33,632,544	(3,385,564)					30,246,980