Note 10 - Pension Plans - Net Periodic Pension Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Service cost	$ 28	$ 26
Interest cost on projected benefit obligation	352	368
Expected return on plan assets	(323)	(438)
Recognized actuarial loss	48	45
Net periodic pension expense	$ 105	$ 1