(Tables)

9 Months Ended

Oct. 31, 2013

Business segment reporting [Abstract]

Business segment reporting [Table Text Block]

	Three Months Ended October 31,						Nine Months Ended October 31,
	2013			2012			2013			2012
Net sales
Piping Systems		$42,289			$26,498			$121,825			$69,147
Filtration Products	15,678			20,738			51,635			62,990
Total		$57,967			$47,236			$173,460			$132,137
Gross profit
Piping Systems		$14,726			$6,060			$35,760			$14,327
Filtration Products	2,161			2,616			7,277			8,280
Total		$16,887			$8,676			$43,037			$22,607
Income (loss) from operations
Piping Systems		$9,403			$2,585			$21,276			$4,184
Filtration Products	(486		)	(410		)	(468		)	(505		)
Corporate	(2,537		)	(1,990		)	(6,715		)	(6,516		)
Total		$6,380			$185			$14,093			($2,837	)