Note 11 - Pension Plans - Net Periodic Pension Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Service cost	$ 27	$ 25	$ 83	$ 76
Interest cost on projected benefit obligation	313	364	991	1,103
Expected return on plan assets	(282)	(432)	(901)	(1,312)
Recognized actuarial loss	41	44	133	134
Net periodic pension expense	$ 99	$ 1	$ 306	$ 1