Note 13 - Leases - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Operating lease costs - fixed	$ 214	$ 178	$ 392	$ 356
Operating lease costs - variable	28	27	55	46
Short-term lease costs	510	176	678	214
Total lease costs	$ 752	$ 381	$ 1,125	$ 616