Note 6 - Net Income Per Share (Tables)

12 Months Ended

Mar. 31, 2018

Notes Tables

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	Year Ended March 31,
	2018		2017		2016
Net income (numerator):
Net income	$	37,283	$	23,819	$	20,567
Shares (denominator)
Weighted average number of common shares outstanding used in basic computation		20,346		20,232		20,124
Common shares issuable upon the vesting of restricted stock		77		136		120
Common shares issuable upon conversion of preferred shares		10		10		10
Shares used in diluted computation		20,433		20,378		20,254
Net income per common share:
Basic	$	1.83	$	1.18	$	1.02
Diluted	$	1.82	$	1.17	$	1.02