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Note 4 - Revenue Recognition (Tables)

6 Months Ended

Jul. 31, 2020

Notes Tables

Disaggregation of Revenue [Table Text Block]

		Three Months Ended July 31,																Six Months Ended July 31,
		2020								2019								2020								2019
		Sales				% to Total				Sales				% to Total				Sales				% to Total				Sales				% to Total
Products		$	1,703				8	%		$	5,860				16	%		$	6,168				14	%		$	10,757				18	%
Specialty Piping Systems and Coating
Revenue recognized under input method			9,784				48	%			15,451				42	%			18,346				43	%			24,238				40	%
Revenue recognized under output method			8,877				44	%			15,356				42	%			18,592				43	%			25,948				42	%
Total		$	20,364				100	%		$	36,667				100	%		$	43,106				100	%		$	60,943				100	%

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

		Contract Assets
Balance January 31, 2019		$	1,653
Costs and gross profit recognized during the period for uncompleted contracts from the prior period			(1,038	)
Costs and deferred gross profit incurred on uncompleted contracts not billed at the end of the current period			1,368
Closing Balance at April 30, 2019		$	1,983
Costs and gross profit recognized during the period for uncompleted contracts from the prior period			(1,509	)
Costs and deferred gross profit incurred on uncompleted contracts not billed at the end of the current period			3,000
Closing Balance at July 31, 2019		$	3,474
Balance January 31, 2020		$	2,166
Costs and gross profit recognized during the period for uncompleted contracts from the prior period			(2,896	)
Costs and deferred gross profit incurred on uncompleted contracts not billed at the end of the current period			3,630
Closing Balance at April 30, 2020		$	2,900
Costs and gross profit recognized during the period for uncompleted contracts from the prior period			(1,743	)
Costs and deferred gross profit incurred on uncompleted contracts not billed at the end of the current period			593
Closing Balance at July 31, 2020		$	1,750

		Contract Liabilities
Balance January 31, 2019		$	1,569
Revenue recognized during the period for uncompleted contracts from the prior period			(444	)
New contracts entered into that are uncompleted at the end of the current period			721
Closing Balance at April 30, 2019		$	1,846
Revenue recognized during the period for uncompleted contracts from the prior period			(1,250	)
New contracts entered into that are uncompleted at the end of the current period			545
Closing Balance at July 31, 2019		$	1,141
Balance January 31, 2020		$	1,173
Revenue recognized during the period for uncompleted contracts from the prior period			(17	)
New contracts entered into that are uncompleted at the end of the current period			(95	)
Closing Balance at April 30, 2020		$	1,061
Revenue recognized during the period for uncompleted contracts from the prior period			631
New contracts entered into that are uncompleted at the end of the current period			(925	)
Closing Balance at July 31, 2020		$	767

X

- Definition

Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045

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- Definition

Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045

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- References

No definition available.

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Period Type:	duration