Note 4 - Revenue Recognition - Reconciliation of the Cost in Excess of Billings (Details) - USD ($) $ in Thousands	Jul. 31, 2024	Jan. 31, 2024
Costs incurred on uncompleted contracts	$ 17,686	$ 21,912
Estimated earnings	12,110	11,270
Earned revenue	29,796	33,182
Less billings to date	27,415	30,580
Costs in excess of billings, net	2,381	2,602
Contract assets: Costs and estimated earnings in excess of billings on uncompleted contracts	3,085	3,097
Contract liabilities: Billings in excess of costs and estimated earnings on uncompleted contracts	(704)	(495)
Costs in excess of billings, net	$ 2,381	$ 2,602