Note 5 - Revenue Recognition (Tables)

12 Months Ended

Jan. 31, 2020

Notes Tables

Disaggregation of Revenue [Table Text Block]

	2019					2018
	Sales		% to Total			Sales		% to Total
Products	$	15,991		12	%	$	13,576		11	%
Specialty Piping Systems and Coating
Revenue recognized under input method		48,415		38	%		40,525		31	%
Revenue recognized under output method		63,257		50	%		74,864		58	%
Total	$	127,663		100	%	$	128,965		100	%

Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block]

	Contract Assets
Balance January 31, 2018	$	1,502
Costs and gross profit recognized during the period for uncompleted contracts from the prior period		(6,458	)
Costs and deferred gross profit incurred on uncompleted contracts not billed at the end of the current period		6,609
Balance January 31, 2019	$	1,653
Costs and gross profit recognized during the period for uncompleted contracts from the prior period		(6,697	)
Costs and deferred gross profit incurred on uncompleted contracts not billed at the end of the current period		7,210
Closing Balance at January 31, 2020	$	2,166
	Contract Liabilities
Balance January 31, 2018	$	1,967
Revenue recognized during the period for uncompleted contracts from the prior period		(3,222	)
New contracts entered into that are uncompleted at the end of the current period		2,824
Balance January 31, 2019	$	1,569
Revenue recognized during the period for uncompleted contracts from the prior period		(3,276	)
New contracts entered into that are uncompleted at the end of the current period		2,880
Closing Balance at January 31, 2020	$	1,173

Schedule of Assumptions for Long-Duration Contracts by Product and Guarantee [Table Text Block]

(In thousands)	2019			2018
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
Balance sheet classification
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	)
Costs in excess of billings, net	$	993		$	84