Note 10 - Pension Plans - Net Periodic Pension Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Service cost	$ 25	$ 26	$ 76	$ 78
Interest cost on projected benefit obligation	364	443	1,103	1,383
Expected return on plan assets	(432)	(469)	(1,312)	(1,460)
Recognized actuarial loss	44	17	134	53
Net periodic pension expense	$ 1	$ 17	$ 1	$ 54