Note 7 - Shareholders' Equity (Tables)

12 Months Ended

Mar. 31, 2018

Notes Tables

Dividends Declared [Table Text Block]

Declaration Date	Per Share Dividend		Record Date	Total Amount (In thousands)		Payment Date
May 8, 2017		$0.20	May 19, 2017	$	4,105	May 26, 2017
July 24, 2017		$0.20	August 7, 2017	$	4,121	August 18, 2017
October 23, 2017		$0.20	November 6, 2017	$	4,121	November 17, 2017
January 22, 2018		$0.25	February 5, 2018	$	5,150	February 16, 2018