Note 4 - Revenue Recognition - Reconciliation of the Cost in Excess of Billings (Details) - USD ($) $ in Thousands	Apr. 30, 2023	Jan. 31, 2023
Costs incurred on uncompleted contracts	$ 17,909	$ 18,342
Estimated earnings	9,657	9,370
Earned revenue	27,566	27,712
Less billings to date	28,041	26,329
(Billings in excess of cost)/costs in excess of billings, net	(475)	1,383
Contract assets: Costs and estimated earnings in excess of billings on uncompleted contracts	2,974	3,126
Contract liabilities: Billings in excess of costs and estimated earnings on uncompleted contracts	$ (3,449)	$ (1,743)