Note 4 - Revenue Recognition - Reconciliation of the Cost in Excess of Billings (Details) - USD ($) $ in Thousands	Apr. 30, 2022	Jan. 31, 2022
Costs incurred on uncompleted contracts	$ 23,326	$ 20,021
Estimated earnings	13,531	12,030
Earned revenue	36,857	32,051
Less billings to date	32,026	31,019
Costs in excess of billings, net	4,831	1,032
Contract assets: Costs and estimated earnings in excess of billings on uncompleted contracts	6,004	2,309
Contract liabilities: Billings in excess of costs and estimated earnings on uncompleted contracts	$ (1,173)	$ (1,277)