Note 10 - Pension Plans - Net Periodic Pension Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Service cost	$ 26	$ 26
Interest cost on projected benefit obligation	368	473
Expected return on plan assets	(438)	(497)
Recognized actuarial loss	45	18
Net periodic pension expense	$ 1	$ 20