CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
Apr. 30, 2017	Apr. 30, 2016
Operating activities
Net loss	$ (3,489)	$ (6,294)
Adjustments to reconcile net loss to net cash flows (used in) provided by operating activities
Depreciation and amortization	1,215	1,448
Loss on consolidation of joint venture	0	1,620
Gain on disposal of subsidiaries	0	(867)
Deferred tax benefit	(290)	(376)
Stock-based compensation expense	203	342
Cash surrender value on life insurance policies	0	(129)
Loss on disposal of fixed assets	(1)	0
Provision on uncollectible accounts	(329)	196
Changes in operating assets and liabilities
Accounts receivable	7,546	12,228
Inventories	(1,775)	3,342
Costs and estimated earnings in excess of billings on uncompleted contracts	(978)	584
Accounts payable	(936)	(4,247)
Accrued compensation and payroll taxes	(584)	(2,536)
Customers' deposits	(191)	(2,057)
Income taxes receivable and payable	(755)	(81)
Prepaid expenses and other current assets	(1,122)	(581)
Other assets and liabilities	472	1,186
Net cash (used in) provided by operating activities	(1,012)	3,778
Investing activities
Acquisition of interest in subsidiary, net of cash acquired	0	(4,672)
Capital expenditures	(267)	(796)
Proceeds from surrender of corporate-owned life insurance policies	0	1,894
Proceeds from sales of property and equipment	1	0
Net cash used in investing activities	(266)	(3,574)
Financing activities
Proceeds from revolving lines	8,612	14,786
Payments of debt on revolving lines of credit	(6,763)	(19,267)
Payments of other debt	(70)	(81)
Increase (decrease) in drafts payable	50	(217)
Payments on capitalized lease obligations	(72)	(1,069)
Release of common stock	13	0
Stock options exercised and restricted shares issued	114	56
Net cash provided by (used in) financing activities	1,884	(5,792)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	892	435
Net increase (decrease) in cash, cash equivalents and restricted cash	1,498	(5,153)
Cash, cash equivalents and restricted cash - beginning of period	8,701	18,955
Cash, cash equivalents and restricted cash - end of period	10,199	13,802
Supplemental cash flow information
Interest paid	177	289
Income taxes paid	530	197
Funds held in escrow related to the sale of Filtration assets	$ 502	$ 502

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-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Aggregate cash proceeds received from a combination of transactions that are classified as investing activities in which assets, which may include one or more investments, are sold to third-party buyers. This element can be used by entities to aggregate proceeds from all asset sales that are classified as investing activities.

+ References

No definition available.

+ Details

Name:	us-gaap_ProceedsFromSalesOfAssetsInvestingActivities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.5)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow for the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer).

+ References

+ Details

Name:	us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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