Note 4 - Revenue Recognition - Reconciliation of the Cost in Excess of Billings (Details) - USD ($) $ in Thousands	Oct. 31, 2022	Jan. 31, 2022
Costs incurred on uncompleted contracts	$ 17,901	$ 20,021
Estimated earnings	9,209	12,030
Earned revenue	27,110	32,051
Less billings to date	22,991	31,019
Costs in excess of billings, net	4,119	1,032
Contract assets: Costs and estimated earnings in excess of billings on uncompleted contracts	5,381	2,309
Contract liabilities: Billings in excess of costs and estimated earnings on uncompleted contracts	$ (1,262)	$ (1,277)