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Retirement plans Defined pension disclosure (Tables)
 12 Months Ended
Jan. 31, 2018
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]

Reconciliation of benefit obligations, plan assets and funded status of plan (in thousands)
2017

2016

Accumulated benefit obligations
 
 
Vested benefits
$6,658
$6,500
Accumulated benefits
$6,658
$6,500
 
 
 
Change in benefit obligation
 
 
Benefit obligation - beginning of year
$6,500
$7,020
Interest cost
253

278

Actuarial loss (gain)
249

(493
)
Benefits paid
(344
)
(305
)
Benefit obligation - end of year
$6,658
$6,500
 
 
 
Change in plan assets
 
 
Fair value of plan assets - beginning of year
$6,228
$5,883
Actual gain on plan assets
816

650

Benefits paid
(344
)
(305
)
Fair value of plan assets - end of year
$6,700
$6,228
 
 
 
Unfunded status
$42
$(272)
 
 
 
Balance sheet classification
 
 
Prepaid expenses and other current assets
$349
$348
Other assets
1,350

1,201

Deferred compensation liabilities
(1,657
)
(1,821
)
Net amount recognized
$42
$(272)
 
 
 
Amounts recognized in accumulated other comprehensive loss
 
 
Unrecognized actuarial loss
$1,307
$1,472
Net amount recognized
$1,307
$1,472