Note 5 - Revenue Recognition - Reconciliation of the Cost in Excess of Billings (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Jan. 31, 2019
Costs incurred on uncompleted contracts	$ 15,553	$ 12,348
Estimated earnings	8,641	7,430
Earned revenue	24,194	19,778
Less billings to date	23,201	19,694
Costs in excess of billings, net	993	84
Contract assets: Costs and estimated earnings in excess of billings on uncompleted contracts	2,166	1,653
Contract liabilities: Billings in excess of costs and estimated earnings on uncompleted contracts	$ (1,173)	$ (1,569)