Note 4 - Revenue Recognition - Reconciliation of the Cost in Excess of Billings (Details) - USD ($) $ in Thousands	Jan. 31, 2024	Jan. 31, 2023
Costs incurred on uncompleted contracts	$ 21,912	$ 18,342
Estimated earnings	11,270	9,370
Earned revenue	33,182	27,712
Less billings to date	30,580	26,329
Costs in excess of billings, net	2,602	1,383
Contract assets: Costs and estimated earnings in excess of billings on uncompleted contracts	3,097	3,126
Contract liabilities: Billings in excess of costs and estimated earnings on uncompleted contracts	(495)	(1,743)
Costs in excess of billings, net	$ 2,602	$ 1,383