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Note 5 - Revenue Recognition - Reconciliation of the Cost in Excess of Billings (Details) - USD ($) $ in Thousands	Jan. 31, 2019	Jan. 31, 2018
Costs incurred on uncompleted contracts	$ 12,348	$ 11,955
Estimated earnings	7,430	6,336
Earned revenue	19,778	18,291
Less billings to date	19,694	18,756
Costs in excess of billings, net	84	(465)
Contract assets: Costs and estimated earnings in excess of billings on uncompleted contracts	1,653	1,502
Contract liabilities: Billings in excess of costs and estimated earnings on uncompleted contracts	$ (1,569)	$ (1,967)