(Tables)

9 Months Ended

Oct. 31, 2012

Business segment reporting [Abstract]

Business segment reporting [Table Text Block]

	Three Months Ended October 31,						Nine Months Ended October 31,
	2012			2011			2012			2011
Net sales
Piping Systems		$26,498			$35,371			$69,147			$80,737
Filtration Products	20,738			24,000			62,990			74,122
Industrial Process Cooling	9,199			8,948			27,225			24,334
Corporate and Other	1,890			3,011			3,952			9,528
Total		$58,325			$71,330			$163,314			$188,721
Gross profit
Piping Systems		$6,060			$6,222			$14,327			$13,666
Filtration Products	2,616			3,409			8,280			10,258
Industrial Process Cooling	2,617			2,486			7,586			6,657
Corporate and Other	153			315			287			877
Total		$11,446			$12,432			$30,480			$31,458
Income (loss) from operations
Piping Systems		$2,585			$3,026			$4,183			$3,730
Filtration Products	(410		)	315			(506		)	1,341
Industrial Process Cooling	526			517			1,403			1,014
Corporate and Other	(2,020		)	(1,626		)	(6,789		)	(5,409		)
Total		$681			$2,232			($1,709	)		$676
Income (loss) before income taxes
Piping Systems		$3,116			$3,709			$4,537			$4,314
Filtration Products	(410		)	315			(506		)	1,341
Industrial Process Cooling	526			517			1,403			1,014
Corporate and Other	(2,614		)	(2,021		)	(8,174		)	(6,423		)
Total		$618			$2,520			($2,740	)		$246