Note 7 - Operating Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Mar. 31, 2020
Right-of-use assets	$ 4,128	$ 4,128
Accumulated lease amortization	(450)	(294)
Total right-of-use assets	3,678	3,834
Current lease liabilities	333	319
Non-current lease liabilities	3,349	3,519
Total lease liabilities	$ 3,682	$ 3,838