Note 10 - Leases - Lease Costs (Details) - USD ($) $ in Thousands		3 Months Ended	6 Months Ended
		Jul. 31, 2019	Jul. 31, 2019
Amortization of ROU assets		$ 51	$ 102
Interest on lease liabilities		8	17
Operating lease costs		581	1,132
Short-term lease costs (1)	[1]	82	266
Sub-lease income		(20)	(40)
Total Lease costs		$ 702	$ 1,477

[1] Includes variable lease costs, which are immaterial