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Note 12 - Employee Benefit and Retirement Plans (Tables)
 12 Months Ended
Jun. 30, 2020
Notes Tables  
Schedule of Allocation of Plan Assets [Table Text Block]
   
20
20
    
201
9
  
Asset category:
                
Cash equivalents
    
4
%
    
2
%
Fixed income
    
27
%
    
31
%
Equities
    
40
%
    
35
%
Mutual and pooled funds
    
29
%
    
32
%
     
100
%
    
100
%
Schedule of Portfolio By Valuation Category [Table Text Block]
June 30, 2020
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Asset Category
  
Level 1
    
Level 2
    
Level 3
    
Total
    
%
  
Cash Equivalents
   $
5,165
     $
-
     $
-
     $
5,165
      
4
%
Fixed Income
    
-
      
32,740
      
-
      
32,740
      
27
%
Equities
    
48,947
      
888
      
-
      
49,835
      
40
%
Mutual & Pooled Funds
    
-
      
30,687
      
-
      
30,687
      
29
%
Total
   $
54,112
     $
64,315
     $
-
     $
118,427
      
100
%
June 30, 201
9
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Asset Category
  
Level 1
    
Level 2
    
Level 3
    
Total
    
%
  
Cash Equivalents
   $
1,818
     $
-
     $
-
     $
1,818
      
2
%
Fixed Income
    
-
      
38,232
      
-
      
38,232
      
31
%
Equities
    
41,629
      
1,482
      
-
      
43,111
      
35
%
Mutual & Pooled Funds
    
2,362
      
36,510
      
-
      
38,872
      
32
%
Total
   $
45,809
     $
76,224
     $
-
     $
122,033
      
100
%
Schedule of Changes in Projected Benefit Obligations [Table Text Block]
   
20
20
    
201
9
    
201
8
  
Change in benefit obligation
                        
Benefit obligation at beginning of year
   $
169,680
     $
159,213
     $
169,696
  
Interest cost
    
5,417
      
6,013
      
6,077
  
Exchange rate changes
    
(1,013
)
    
(1,697
)
    
707
  
Benefits paid
    
(7,203
)
    
(7,217
)
    
(6,489
)
Actuarial (gain) loss
    
17,309
      
13,368
      
(10,778
)
Benefit obligation at end of year
   $
184,190
     $
169,680
     $
159,213
  
                         
Change in plan assets
                        
Fair value of plan assets at beginning of year
    
122,033
      
118,693
      
117,778
  
Actual return on plan assets
    
2,163
      
6,589
      
2,545
  
Employer contributions
    
7,687
      
5,413
      
4,366
  
Benefits paid
    
(7,203
)
    
(7,217
)
    
(6,489
)
Exchange rate changes
    
(845
)
    
(1,445
)
    
493
  
Fair value of plan assets at end of year
    
123,826
      
122,033
      
118,693
  
Funded status at end of year
   $
(60,364
)
   $
(47,647
)
   $
(40,520
)
Amounts recognized in balance sheet
                        
Current liability
   $
(373
)
   $
(324
)
   $
(67
)
Noncurrent liability
    
(59,991
)
    
(47,323
)
    
(40,453
)
Net amount recognized in balance sheet
   $
(60,364
)
   $
(47,647
)
   $
(40,520
)
                         
Amounts not yet reflected in net periodic benefit costs and included in accumulated other comprehensive loss
                        
Accumulated loss
   $
(19,113
)
   $
(15,590
)
   $
(4,038
)
Amounts not yet recognized as a component of net periodic benefit cost
    
(19,113
)
    
(15,590
)
    
(4,038
)
Accumulated net periodic benefit cost in excess of contributions
    
(41,249
)
    
(32,057
)
    
(36,482
)
Net amount recognized
   $
(60,634
)
   $
(47,647
)
   $
(40,520
)
                         
                         
                         
Components of net periodic benefit cost
                        
Interest cost
   $
5,417
     $
6,013
     $
6,077
  
Expected return on plan assets
    
(5,193
)
    
(5,129
)
    
(5,140
)
Recognized actuarial loss
    
16,753
      
284
      
26
  
Net periodic benefit cost
   $
16,977
     $
1,168
     $
963
  
                         
Estimated amounts that will be amortized from accumulated other comprehensive loss over the next year
                        
Net loss
   $
(53
)
   $
(38
)
   $
(28
)
                         
Information for pension plans with accumulated benefits in excess of plan assets
                        
Projected benefit obligation
   $
184,190
     $
169,680
     $
159,213
  
Accumulated benefit obligation
   $
184,190
     $
169,680
     $
159,213
  
Fair value of assets
   $
123,826
     $
122,033
     $
118,693
  
   
20
20
    
201
9
    
201
8
  
Change in benefit obligation
                        
Benefit obligation at beginning of year
   $
126,380
     $
116,277
     $
124,138
  
Service cost
    
-
      
-
      
-
  
Interest cost
    
4,417
      
4,854
      
4,804
  
Plan curtailment
    
-
      
-
      
-
  
Benefits paid
    
(5,682
)
    
(5,565
)
    
(4,786
)
Actuarial (gain) loss
    
13,016
      
10,814
      
(7,879
)
Benefit obligation at end of year
   $
138,131
     $
126,380
     $
116,277
  
                         
Weighted average assumptions – benefit obligation
                        
Discount rate
    
2.73
%
    
3.56
%
    
4.27
%
Rate of compensation increase
    
n/a
      
n/a
      
n/a
  
                         
Change in plan assets
                        
Fair value of plan assets at beginning of year
   $
85,150
     $
82,140
     $
81,928
  
Actual return on plan assets
    
1,071
      
4,132
      
1,645
  
Employer contributions
    
6,753
      
4,443
      
3,353
  
Benefits paid
    
(5,682
)
    
(5,565
)
    
(4,786
)
Fair value of plan assets at end of year
    
87,292
      
85,150
      
82,140
  
Funded status at end of year
   $
(50,839
)
   $
(41,230
)
   $
(34,137
)
                         
Amounts recognized in balance sheet
                        
Current liability
   $
(373
)
   $
(324
)
   $
(67
)
Noncurrent liability
    
(50,466
)
    
(40,906
)
    
(34,070
)
Net amount recognized in balance sheet
   $
(50,839
)
   $
(41,230
)
   $
(34,137
)
                         
Weighted average assumptions – net periodic benefit cost
                        
Discount rate
    
3.56
%
    
4.27
%
    
3.92
%
Rate of compensation increase
  
Varies
    
Varies
    
Varies
  
Return on plan assets
    
5.00
%
    
5.00
%
    
5.00
%
                         
Amounts not yet reflected in net periodic benefit cost and included in accumulated other comprehensive loss
                        
Accumulated loss
   $
(14,507
)
   $
(13,196
)
   $
(2,731
)
Amounts not yet recognized as a component of net periodic benefit cost
    
(14,507
)
    
(13,196
)
    
(2,731
)
Accumulated contributions less than net periodic benefit cost
    
(36,332
)
    
(28,034
)
    
(31,406
)
Net amount recognized
   $
(50,839
)
   $
(41,230
)
   $
(34,137
)
Components of net periodic benefit cost
                        
Interest cost
   $
4,417
     $
4,854
     $
4,804
  
Expected return on plan assets
    
(4,249
)
    
(4,067
)
    
(4,026
)
Recognized actuarial loss
    
14,883
      
284
      
26
  
Net periodic benefit cost
   $
15,051
     $
1,071
     $
804
  
                         
Estimated amounts that will be amortized from accumulated other comprehensive loss over the next year
                        
Net loss
    
(38
)
    
(38
)
    
(28
)
                         
Information for plan with accumulated benefits in excess of plan assets
                        
Projected benefit obligation
   $
138,131
     $
126,380
     $
116,277
  
Accumulated benefit obligation
   $
138,131
     $
126,380
     $
116,277
  
Fair value of assets
   $
87,292
     $
85,150
     $
82,140
  
   
20
20
    
201
9
    
201
8
  
Change in benefit obligation
                        
Benefit obligation at beginning of year
   $
43,300
     $
42,936
     $
45,558
  
Interest cost
    
1,000
      
1,159
      
1,273
  
Exchange rate changes
    
(1,013
)
    
(1,697
 )    
707
  
Benefits paid
    
(1,521
)
    
(1,652
)
    
(1,703
)
Actuarial (gain) loss
    
4,293
      
2,554
      
(2,899
)
Benefit obligation at end of year
   $
46,059
     $
43,300
     $
42,936
  
Weighted average assumptions - benefit obligation
                        
Discount rate
    
1.59
%
    
2.39
%
    
2.80
%
Rate of compensation increase
    
n/a
      
n/a
      
n/a
  
                         
Change in plan assets
                        
Fair value of plan assets at beginning of year
   $
36,883
     $
36,553
     $
35,850
  
Actual return on plan assets
    
1,092
      
2,457
      
900
  
Employer contributions
    
934
      
970
      
1,013
  
Benefits paid
    
(1,521
)
    
(1,652
)
    
(1,703
)
Exchange rate changes
    
(854
)
    
(1,445
)
    
493
  
Fair value of plan assets at end of year
    
36,534
      
36,883
      
36,553
  
Funded status at end of year
   $
(9,525
)
   $
(6,417
)
    
(6,383
)
Amounts recognized in balance sheet
                        
Noncurrent liability
    
(9,525
)
    
(6,417
)
    
(6,383
)
Net amount recognized in balance sheet
   $
(9,525
)
   $
(6,417
)
   $
(6,383
)
                         
Weighted average assumptions – net periodic benefit cost
                        
                         
Discount rate
    
2.39
%
    
2.80
%
    
2.73
%
Rate of compensation increase
    
n/a
      
n/a
      
n/a
  
Return on plan assets
    
2.62
%
    
2.98
%
    
3.01
%
                         
Amounts not yet reflected in net periodic benefit costs and included in accumulated other comprehensive loss
                        
Accumulated loss
   $
(4,608
)
   $
(2,394
)
   $
(1,307
)
Amounts not yet recognized as a component of net periodic benefit cost
    
(4,608
)
    
(2,394
)
    
(1,307
)
Accumulated net periodic benefit cost in excess of contributions
    
(4,917
)
    
(4,023
)
    
(5,076
)
Net amount recognized
   $
(9,525
)
   $
(6,417
)
   $
(6,383
)
                         
                         
                         
Components of net periodic benefit cost
                        
Interest cost
    
1,000
      
1,159
      
1,273
  
Expected return on plan assets
    
(944
)
    
(1,062
)
    
(1,114
)
Amortization of net loss
    
1,870
      
—
      
—
  
Net periodic benefit cost
   $
1,926
     $
97
     $
159
  
                         
Estimated amounts that will be amortized from accumulated other comprehensive loss over the next year
   $
-
     $
-
     $
-
  
                         
Information for plan with accumulated benefits in excess of plan assets
                        
Projected benefit obligation
   $
46,059
     $
43,300
     $
42,936
  
Accumulated benefit obligation
   $
46,059
     $
43,300
     $
42,936
  
Fair value of assets
   $
36,534
     $
36,883
     $
36,553
  
Schedule of Medical and Life Insurance Benefits [Table Text Block]
   
20
20
    
201
9
    
201
8
  
Change in benefit obligation:
                        
Benefit obligation at beginning of year
   $
6,930
     $
6,385
     $
7,086
  
Service cost
    
73
      
72
      
85
  
Interest cost
    
240
      
265
      
270
  
Benefits paid
    
(329
)
    
(346
)
    
(388
)
Actuarial (gain) loss
    
791
      
554
      
(668
)
Benefit obligation at end of year
   $
7,705
     $
6,930
     $
6,385
  
                         
Weighted average assumptions: benefit obligations
                        
Discount rate
    
2.73
%
    
3.56
%
    
4.27
%
Rate of compensation increase
    
2.64
%
    
2.64
%
    
2.64
%
                         
Change in plan assets
                        
Employer contributions
    
329
      
346
      
388
  
Benefits paid, net of employee contributions
    
(329
)
    
(346
)
    
(388
)
Fair value of plan assets at end of year
    
—
      
—
      
—
  
                         
Amounts recognized in balance sheet
                        
Current postretirement benefit obligation
   $
(358
)
   $
(353
)
   $
(339
)
Non-current postretirement benefit obligation
    
(7,347
)
    
(6,577
)
    
(6,046
)
Net amount recognized in balance sheet
   $
(7,705
)
   $
(6,930
)
   $
(6,385
)
                         
Weighted average assumptions – net periodic benefit cost
                        
Discount rate
    
3.56
%
    
4.27
%
    
3.92
%
Rate of compensation increase
    
2.64
%
    
2.64
%
    
2.64
%
                         
Amounts not yet reflected in net periodic benefit cost and included in accumulated other comprehensive loss
                        
Prior service credit
   $
2,240
     $
2,777
     $
3,314
  
Accumulated gain (loss)
    
(2,160
)
    
(1,452
)
    
(928
)
Amounts not yet recognized as a component of net periodic benefit cost
    
80
      
1,325
      
2,386
  
Net periodic benefit cost in excess of accumulated contributions
    
(7,785
)
    
(8,255
)
    
(8,771
)
Net amount recognized
   $
(7,705
)
   $
(6,390
)
   $
(6,385
)
Components of net periodic benefit cost
                        
Service cost
   $
73
     $
72
     $
85
  
Interest cost
    
240
      
265
      
270
  
Amortization of prior service credit
    
(537
)
    
(537
)
    
(537
)
Amortization of accumulated loss
    
83
      
30
      
99
  
Net periodic benefit cost
   $
(141
)
   $
(170
)
   $
(83
)
Estimated amounts that will be amortized from accumulated other comprehensive loss over the next year
                        
Prior service credit
   $
537
     $
537
     $
537
  
Net loss
    
(166
)
    
(83
)
    
(30
)
    $
371
     $
454
     $
507
  
                         
Healthcare cost trend rate assumed for next year
    
n/a
      
6.60
%
    
6.60
%
Rate to which the cost trend rate gradually declines
    
n/a
      
4.50
%
    
4.50
%
Year that the rate reaches the rate at which it is assumed to remain
    
n/a
      
2037
      
2037
  
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block]
   
1% Increase
  
   
20
20
    
201
9
    
201
8
  
Effect on postretirement benefit obligation
   $
1
     $
1
     $
1
  
   
1% Decrease
  
   
20
20
    
201
9
    
201
8
  
Effect on postretirement benefit obligation
   $
(1
)
   $
(1
)
   $
(1
)
Schedule of Expected Benefit Payments [Table Text Block]
Fiscal Year
  
Pension
    
Other
Benefits
  
2021
   $
7,913
     $
358
  
2022
    
8,250
      
363
  
2023
    
8,610
      
353
  
2024
    
8,643
      
358
  
2025
    
9,150
      
364
  
After
    
56,032
      
1,889
  
    $
98,598
     $
3,685