Note 5 - Other Assets - Unrealized Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Total gross unrealized losses	$ 599	$ 172
Total fair value	732	1,513
Less than 12 months gross unrealized losses	552	29
Less than 12 months fair value	469	581
12 months or greater gross unrealized losses	47	143
12 months or greater fair value	$ 263	$ 932