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Note 4 - Revenue Recognition - Revenues by Revenue Class (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019
Net sales	$ 20,294	$ 34,457	$ 63,399	$ 95,400
Sales by product, percent	100.00%	100.00%	100.00%	100.00%
Product [Member] | Transferred at Point in Time [Member]
Net sales	$ 2,435	$ 2,448	$ 8,603	$ 13,205
Sales by product, percent	12.00%	7.00%	14.00%	14.00%
Specialty Piping Systems And Coating [Member] | Transferred at Point in Time Using Input Method [Member]
Net sales	$ 8,252	$ 14,363	$ 26,597	$ 38,601
Sales by product, percent	41.00%	42.00%	42.00%	40.00%
Specialty Piping Systems And Coating [Member] | Transferred at Point in Time Using Output Method [Member]
Net sales	$ 9,607	$ 17,646	$ 28,199	$ 43,594
Sales by product, percent	47.00%	51.00%	44.00%	46.00%

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- Definition

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+ References

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