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Note 4 - Revenue Recognition - Contract With Customer, Asset and Liability (Details) - USD ($)
$ in Thousands
 3 Months Ended
Oct. 31, 2020
Jul. 31, 2020
Apr. 30, 2020
Oct. 31, 2019
Jul. 31, 2019
Apr. 30, 2019
Balance, assets $ 1,750 $ 2,900 $ 2,166 $ 3,474 $ 1,983 $ 1,653
Costs and gross profit recognized during the period for uncompleted contracts from the prior period (930) (1,743) (2,896) (1,799) (1,509) (1,038)
Costs and deferred gross profit incurred on uncompleted contracts not billed at the end of the current period 542 593 3,630 2,688 3,000 1,368
Balance, assets 1,362 1,750 2,900 4,363 3,474 1,983
Balance, liabilities 767 1,061 1,173 1,141 1,846 1,569
Revenue recognized during the period for uncompleted contracts from the prior period 104 631 (17) (774) (1,250) (444)
New contracts entered into that are uncompleted at the end of the current period (199) (925) (95) 984 545 721
Balance, liabilities $ 672 $ 767 $ 1,061 $ 1,351 $ 1,141 $ 1,846