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Deferred and restricted stock (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Jan. 31, 2018 | Jan. 31, 2017 | Jan. 31, 2016
Restricted stock [Line Items] |  |  |
Deferred compensation liabilities | $ 815,000 | $ 529,000 |
Vesting period | P4Y |  |
Restricted stock grants | 178,000 | 254,000 |
Restricted stock granted, weighted average grant price | $ 8.06 | $ 7.29 |
Restricted stock issued | (101,000) | (123,000) |
Restricted stock forfeited | (7,000) | (4,000) |
Restricted stock, forfeitures, weighted average grant price | $ 7.15 | $ 6.72 |
Deferred shares outstanding |  | 290,000 | 163,000
Restricted stock, outstanding, weighted average grant price | $ 9.05 | $ 8.75 | $ 6.40
Restricted stock, aggregate intrinsic value | $ 3,254,000 | $ 2,533,000 | $ 1,040,000
Unrecognized restricted stock expense | $ 100,000 |  |
Cost is expected to be recognized over the weighted-average period | 1 year |  |
Director [Member] |  |  |
Restricted stock [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Method of Measuring Cost of Award | mark-to-market adjustment on a quarterly basis |  |
Deferred shares granted value | $ 40,000 |  |
Vesting period | stock vests on the date of grant |  |
distributed to the directors upon their separation from service | distributed to the directors upon their separation from service |  |
Deferred shares outstanding | 90,070 |  |
Restricted Stock [Member] |  |  |
Restricted stock [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Method of Measuring Cost of Award | The Company calculates restricted stock compensation expense based on the grant date fair value and recognizes expense on a straight-line basis over the vesting period. |  |
Deferred shares outstanding | 360,000 |  |
Unrecognized restricted stock expense | $ 1,400,000 |  |
Cost is expected to be recognized over the weighted-average period | 1 year 1 month |  |
Restricted Stock [Member] | Minimum [Member] |  |  |
Restricted stock [Line Items] |  |  |
Vesting period restricted stock | 3 years |  |
Restricted Stock [Member] | Maximum [Member] |  |  |
Restricted stock [Line Items] |  |  |
Vesting period restricted stock | 4 years |  |

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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of equity instruments other than options outstanding, including both vested and non-vested instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Description of pertinent provisions of equity-based compensation awards that have actual or potential impact upon the company's financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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