Note 5 - Revenue Recognition - Contract With Customer, Asset and Liability (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Balance, assets	$ 1,653	$ 1,502
Costs and gross profit recognized during the period for uncompleted contracts from the prior period	(6,697)	(6,458)
Costs and deferred gross profit incurred on uncompleted contracts not billed at the end of the current period	7,210	6,609
Balance, assets	2,166	1,653
Balance, liability	1,569	1,967
Revenue recognized during the period for uncompleted contracts from the prior period	(3,276)	(3,222)
New contracts entered into that are uncompleted at the end of the current period	2,880	2,824
Balance, liability	$ 1,173	$ 1,569