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Note 9 - Retirement Plans (Tables)
 12 Months Ended
Jan. 31, 2020
Notes Tables  
Schedule of Allocation of Plan Assets [Table Text Block]
(In thousands)
  
2019
  
2018
Level 1 market value of plan assets
      
 
      
 
Equity securities
   $
3,139
 
   $
2,991
 
U.S. bond market
    
2,134
 
    
2,065
 
Real estate securities
    
369
 
    
368
 
Subtotal
    
5,642
 
    
5,424
 
Level 2 significant other observable inputs
      
 
      
 
Money market fund
   $
169
 
   $
121
 
Subtotal
    
169
 
    
121
 
Investments measured at net asset value*
   $
739
 
   $
634
 
Total
   $
6,550
 
   $
6,179
 
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
Reconciliation of benefit obligations, plan assets and funded status of plan (in thousands)
  
2019
  
2018
Accumulated benefit obligations
      
 
      
 
Vested benefits
   $
6,959
 
   $
6,258
 
Accumulated benefits
   $
6,959
 
   $
6,258
 
                 
Change in benefit obligation
      
 
      
 
Benefit obligation - beginning of year
   $
6,258
 
   $
6,658
 
Interest cost
    
237
 
    
240
 
Actuarial (gain)/loss
    
788
 
    
(303
)
Benefits paid
    
(324
)
    
(337
)
Benefit obligation - end of year
   $
6,959
 
   $
6,258
 
                 
Change in plan assets
      
 
      
 
Fair value of plan assets - beginning of year
   $
6,179
 
   $
6,700
 
Actual (loss)/gain on plan assets    
695
 
    
(184
)
Benefits paid
    
(324
)
    
(337
)
Fair value of plan assets - end of year
   $
6,550
 
   $
6,179
 
                 
Unfunded status
   $
(409
)
   $
(80
)
                 
Balance sheet classification
      
 
      
 
Prepaid expenses and other current assets
   $
325
 
   $
343
 
Other assets
    
1,679
 
    
1,568
 
Deferred compensation liabilities
    
(2,413
)
    
(1,991
)
Net amount recognized
   $
(409
)
   $
(80
)
                 
Amounts recognized in accumulated other comprehensive loss
      
 
      
 
Unrecognized actuarial loss
   $
2,087
 
   $
1,648
 
Net amount recognized
   $
2,087
 
   $
1,648
 
Defined Benefit Plan, Assumptions [Table Text Block]
Weighted-average assumptions used to determine net cost and benefit obligations
  
2019
  
2018
End of year benefit obligation discount rate
    
2.80
%
    
3.90
%
Service cost discount rate
    
3.90
%
    
3.70
%
Expected return on plan assets
    
7.50
%
    
8.00
%
Schedule of Net Benefit Costs [Table Text Block]
Components of net periodic benefit cost (in thousands)
  
2019
  
2018
Interest cost
   $
237
 
   $
240
 
Expected return on plan assets
    
(450
)
    
(522
)
Recognized actuarial loss
    
102
 
    
64
 
Net periodic benefit income
   $
(111
)
   $
(218
)
                 
Amounts recognized in other comprehensive income (in thousands)
      
 
      
 
Actuarial gain/(loss) on obligation
   $
(787
)
   $
303
 
Actual (loss)/gain on plan assets
    
348
 
    
(644
)
Total in other comprehensive income
   $
(439
)
   $
(341
)
Schedule of Expected Benefit Payments [Table Text Block]
Cash flows (in thousands)
        
 
Expected employer contributions for the fiscal year ending January 31, 2021
     $
—
  
Expected employee contributions for the fiscal year ending January 31, 2021
      
—
  
Estimated future plan benefit payments reflecting expected future service for the fiscal year(s) ending January 31,:
          
2021
     $
325
  
2022
      
332
  
2023
      
332
  
2024
      
327
  
2025
      
328
  
2026 - 2030      
1,643
  
Multiemployer Plan [Table Text Block]
   
 
  
 
  
Funded
  
 
  
 
    
 
  
 
  
Collective
   
 
  
 
  
Zone
  
FIP/RP Status
  
2019
    
2018
  
Surcharge
  
Bargaining
Plan Name
  
EIN
  
Plan #
  
Status
  
Pending/Implemented
  
Contribution
    
Contribution
  
Imposed
  
Expiration Date
Plumbers & Pipefitters Local 572 Pension Fund
  
626102837
  
001
  
Green
  
No
  
$239
    
$188
  
No
  
3/31/2022