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Note 4 - Revenue Recognition (Tables)

9 Months Ended

Oct. 31, 2019

Notes Tables

Disaggregation of Revenue [Table Text Block]

		Three Months Ended October 31,																Nine Months Ended October 31,
		2019								2018								2019								2018
		Sales				% to Total				Sales				% to Total				Sales				% to Total				Sales				% to Total
Products		$	2,448				7	%		$	4,439				14	%		$	13,205				14	%		$	9,447				10	%
Specialty Piping Systems and Coating
Revenue recognized under input method			14,363				42	%			11,869				36	%			38,601				40	%			32,778				35	%
Revenue recognized under output method			17,646				51	%			16,498				50	%			43,594				46	%			51,795				55	%
Total		$	34,457				100	%		$	32,806				100	%		$	95,400				100	%		$	94,020				100	%

Contract with Customer, Asset and Liability [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
Costs and gross profit recognized during the period for uncompleted contracts from the prior period			(1,799	)
Costs and deferred gross profit incurred on uncompleted contracts not billed at the end of the current period			2,688
Closing Balance at October 31, 2019		$	4,363

		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
Revenue recognized during the period for uncompleted contracts from the prior period			(774	)
New contracts entered into that are uncompleted at the end of the current period			984
Closing Balance at October 31, 2019		$	1,351

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- Definition

Tabular disclosure of contract balances and changes in contract balances.

+ 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=118956577&loc=SL49130551-203045

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+ 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=118956577&loc=SL49130545-203045

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