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Note 12 - Employee Benefit and Retirement Plans (Tables)
 12 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Allocation of Plan Assets [Table Text Block]
   
201
9
    
201
8
  
Asset category:
                
Cash equivalents
    
2
%
    
1
%
Fixed income
    
31
%
    
27
%
Equities
    
35
%
    
34
%
Mutual and pooled funds
    
32
%
    
38
%
     
100
%
    
100
%
Schedule of Portfolio By Valuation Category [Table Text Block]
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
%
June 30,
201
8
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Asset Category
  
Level 1
    
Level 2
    
Level 3
    
Total
    
%
  
Cash Equivalents
   $
945
     $
-
     $
-
     $
945
      
1
%
Fixed Income
    
-
      
32,303
      
-
      
32,303
      
27
%
Equities
    
38,988
      
1,521
      
-
      
40,509
      
34
%
Mutual & Pooled Funds
    
8,880
      
36,056
      
-
      
44,936
      
38
%
Total
   $
48,813
     $
69,880
     $
-
     $
118,693
      
100
%
Schedule of Changes in Projected Benefit Obligations [Table Text Block]
   
201
9
    
201
8
    
201
7
  
Change in benefit obligation
                        
Benefit obligation at beginning of year
   $
159,213
     $
169,696
     $
175,233
  
Service cost
    
-
      
-
      
1,405
  
Interest cost
    
6,013
      
6,077
      
6,246
  
Plan curtailment
    
-
      
-
      
(4,170
)
Exchange rate changes
    
(1,697
)
    
707
      
(909
)
Benefits paid
    
(7,217
)
    
(6,489
 )    
(6,902
)
Actuarial (gain) loss
    
13,368
      
(10,778
)
    
(1,207
)
Benefit obligation at end of year
   $
169,680
     $
159,213
     $
169,696
  
                         
Change in plan assets
                        
Fair value of plan assets at beginning of year
    
118,693
      
117,778
      
115,015
  
Actual return on plan assets
    
6,589
      
2,545
      
5,302
  
Employer contributions
    
5,413
      
4,366
      
5,000
  
Benefits paid
    
(7,217
)
    
(6,489
)
    
(6,902
)
Exchange rate changes
    
(1,445
)
    
493
      
(637
)
Fair value of plan assets at end of year
    
122,033
      
118,693
      
117,778
  
Funded status at end of year
   $
(47,647
)
   $
(40,520
)
   $
(51,918
)
Amounts recognized in balance sheet
                        
Current liability
   $
(324
)
   $
(67
)
   $
(63
)
Noncurrent liability
    
(47,323
)
    
(40,453
)
    
(51,855
)
Net amount recognized in balance sheet
   $
(47,647
)
   $
(40,520
)
   $
(51,918
)
                         
Amounts not yet reflected in net periodic benefit costs and included in accumulated other comprehensive loss
                        
Prior service cost
   $
-
     $
-
     $
-
  
Accumulated loss
    
(15,590
)
    
(4,038
)
    
(12,131
)
Amounts not yet recognized as a component of net periodic benefit cost
    
(15,590
)
    
(4,038
)
    
(12,131
)
Accumulated net periodic benefit cost in excess of contributions
    
(32,057
)
    
(36,482
)
    
(39,787
)
Net amount recognized
   $
(47,647
)
   $
(40,520
)
   $
(51,918
)
                         
Components of net periodic benefit cost
                        
Service cost
   $
-
     $
-
     $
1,405
  
Interest cost
    
6,013
      
6,077
      
6,246
  
Expected return on plan assets
    
(5,129
)
    
(5,140
)
    
(5,173
)
Recognized actuarial loss
    
284
      
26
      
107
  
Net periodic benefit cost
   $
1,168
     $
963
     $
2,585
  
                         
Estimated amounts that will be amortized from accumulated other comprehensive loss over the next year
                        
Prior service cost
   $
-
     $
-
     $
-
  
Net loss
    
(38
)
    
(28
)
    
(26
)
                         
Information for pension plans with accumulated benefits in excess of plan assets
                        
Projected benefit obligation
   $
169,680
     $
159,213
     $
169,696
  
Accumulated benefit obligation
   $
169,680
     $
159,213
     $
169,696
  
Fair value of assets
   $
122,033
     $
118,693
     $
117,778
  
   
201
9
    
201
8
    
201
7
  
Change in benefit obligation
                        
Benefit obligation at beginning of year
   $
116,277
     $
124,138
     $
130,863
  
Service cost
    
-
      
-
      
1,405
  
Interest cost
    
4,854
      
4,804
      
4,994
  
Plan curtailment
    
-
      
-
      
(4,170
)
Benefits paid
    
(5,565
)
    
(4,786
)
    
(5,106
)
Actuarial (gain) loss
    
10,814
      
(7,879
)
    
(3,848
)
Benefit obligation at end of year
   $
126,380
     $
116,277
     $
124,138
  
                         
Weighted average assumptions – benefit obligation
                        
Discount rate
    
3.56
%
    
4.27
%
    
3.92
%
Rate of compensation increase
    
n/a
      
n/a
    
Varies
  
                         
Change in plan assets
                        
Fair value of plan assets at beginning of year
   $
82,140
     $
81,928
     $
81,910
  
Actual return on plan assets
    
4,132
      
1,645
      
1,079
  
Employer contributions
    
4,443
      
3,353
      
4,045
  
Benefits paid
    
(5,565
)
    
(4,786
)
    
(5,106
)
Fair value of plan assets at end of year
    
85,150
      
82,140
      
81,928
  
Funded status at end of year
   $
(41,230
)
   $
(34,137
)
   $
(42,210
)
                         
Amounts recognized in balance sheet
                        
Current liability
   $
(324
)
   $
(67
)
   $
(63
)
Noncurrent liability
    
(40,906
)
    
(34,070
)
    
(42,147
)
Net amount recognized in balance sheet
   $
(41,230
)
   $
(34,137
)
   $
(42,210
)
                         
Weighted average assumptions – net periodic benefit cost
                        
Discount rate
    
4.27
%
    
3.92
%
    
3.77
%
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
                        
Prior service cost
   $
-
     $
-
     $
-
  
Accumulated loss
    
(13,196
)
    
(2,731
)
    
(8,254
)
Amounts not yet recognized as a component of net periodic benefit cost
    
(13,196
)
    
(2,731
)
    
(8,254
)
Accumulated contributions less than net periodic benefit cost
    
(28,034
)
    
(31,406
)
    
(33,956
)
Net amount recognized
   $
(41,230
)
   $
(34,137
)
   $
(42,210
)
                         
Components of net periodic benefit cost
                        
Service cost
   $
-
     $
-
     $
1,405
  
Interest cost
    
4,854
      
4,804
      
4,994
  
Expected return on plan assets
    
(4,067
)
    
(4,026
)
    
(4,046
)
Recognized actuarial loss
    
284
      
26
      
107
  
Net periodic benefit cost
   $
1,071
     $
804
     $
2,460
  
                         
Estimated amounts that will be amortized from accumulated other comprehensive loss over the next year
                        
Prior service cost
   $
-
     $
-
     $
-
  
Net loss
    
(38
)
    
(28
)
    
(26
)
                         
Information for plan with accumulated benefits in excess of plan assets
                        
Projected benefit obligation
   $
126,380
     $
116,277
     $
124,138
  
Accumulated benefit obligation
   $
126,380
     $
116,277
     $
124,138
  
Fair value of assets
   $
85,150
     $
82,140
     $
81,928
  
   
201
9
    
201
8
    
201
7
  
Change in benefit obligation
                        
Benefit obligation at beginning of year
   $
42,936
     $
45,558
     $
44,370
  
Interest cost
    
1,159
      
1,273
      
1,252
  
Exchange rate changes
    
(1,697
)
    
707
      
(909
)
Benefits paid
    
(1,652
)
    
(1,703
)
    
(1,796
)
Actuarial (gain) loss
    
2,554
      
(2,899
)
    
2,641
  
Benefit obligation at end of year
   $
43,300
     $
42,936
     $
45,558
  
                         
Weighted average assumptions - benefit obligation
                        
Discount rate
    
2.39
%
    
2.80
%
    
2.73
%
Rate of compensation increase
    
n/a
      
n/a
      
n/a
  
                         
Change in plan assets
                        
Fair value of plan assets at beginning of year
   $
36,553
     $
35,850
     $
33,105
  
Actual return on plan assets
    
2,457
      
900
      
4,223
  
Employer contributions
    
970
      
1,013
      
954
  
Benefits paid
    
(1,652
)
    
(1,703
)
    
(1,796
)
Exchange rate changes
    
(1,445
)
    
493
      
(636
)
Fair value of plan assets at end of year
    
36,883
      
36,553
      
35,850
  
Funded status at end of year
   $
(6,417
)
   $
(6,383
)
    
(9,708
)
Amounts recognized in balance sheet
                        
Current liability
   $
—
     $
—
     $
—
  
Noncurrent liability
    
(6,417
)
    
(6,383
)
    
(9,708
)
Net amount recognized in balance sheet
   $
(6,417
)
   $
(6,383
)
   $
(9,708
)
                         
Weighted average assumptions – net periodic benefit cost
                        
                         
Discount rate
    
2.80
%
    
2.73
%
    
3.00
%
Rate of compensation increase
    
n/a
      
n/a
      
n/a
  
Return on plan assets
    
2.98
%
    
3.01
%
    
3.59
%
                         
Amounts not yet reflected in net periodic benefit costs and included in accumulated other comprehensive loss
                        
Prior service cost
   $
—
     $
—
     $
—
  
Accumulated loss
    
(2,394
)
    
(1,307
)
    
(3,877
)
Amounts not yet recognized as a component of net periodic benefit cost
    
(2,394
)
    
(1,307
)
    
(3,877
)
Accumulated net periodic benefit cost in excess of contributions
    
(4,023
)
    
(5,076
)
    
(5,831
)
Net amount recognized
   $
(6,417
)
   $
(6,383
)
   $
(9,708
)
                         
Components of net periodic benefit cost
                        
Service cost
   $
—
     $
—
     $
—
  
Interest cost
    
1,159
      
1,273
      
1,252
  
Expected return on plan assets
    
(1,062
)
    
(1,114
)
    
(1,127
)
Amortization of net loss
    
—
      
—
      
—
  
Net periodic benefit cost
   $
97
     $
159
     $
125
  
                         
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
   $
43,300
     $
42,936
     $
45,558
  
Accumulated benefit obligation
   $
43,300
     $
42,936
     $
45,558
  
Fair value of assets
   $
36,883
     $
36,553
     $
35,850
  
Schedule of Medical and Life Insurance Benefits [Table Text Block]
   
201
9
    
201
8
    
201
7
  
Change in benefit obligation:
                        
Benefit obligation at beginning of year
   $
6,385
     $
7,086
     $
7,381
  
Service cost
    
72
      
85
      
85
  
Interest cost
    
265
      
270
      
269
  
Benefits paid
    
(346
)
    
(388
)
    
(483
)
Actuarial (gain) loss
    
554
      
(668
)
    
(166
)
Benefit obligation at end of year
   $
6,930
     $
6,385
     $
7,086
  
                         
Weighted average assumptions: benefit obligations
                        
Discount rate
    
3.56
%
    
4.27
%
    
3.92
%
Rate of compensation increase
    
2.64
%
    
2.64
%
    
2.64
%
                         
Change in plan assets
                        
Fair value of plan assets at beginning of year
   $
—
     $
—
     $
—
  
Employer contributions
    
346
      
388
      
483
  
Benefits paid, net of employee contributions
    
(346
)
    
(388
)
    
(483
)
Fair value of plan assets at end of year
    
—
      
—
      
—
  
                         
Amounts recognized in balance sheet
                        
Current postretirement benefit obligation
   $
(353
)
   $
(339
)
   $
(370
)
Non-current postretirement benefit obligation
    
(6,577
)
    
(6,046
)
    
(6,716
)
Net amount recognized in balance sheet
   $
(6,930
)
   $
(6,385
)
   $
(7,086
)
                         
Weighted average assumptions – net periodic benefit cost
                        
Discount rate
    
4.27
%
    
3.92
%
    
3.77
%
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
   $
2,777
     $
3,314
     $
3,851
  
Accumulated gain (loss)
    
(1,452
)
    
(928
)
    
(1,696
)
Amounts not yet recognized as a component of net periodic benefit cost
    
1,325
      
2,386
      
2,155
  
Net periodic benefit cost in excess of accumulated contributions
    
(8,255
)
    
(8,771
)
    
(9,241
)
Net amount recognized
   $
(6,930
)
   $
(6,385
)
   $
(7,086
)
                         
Components of net periodic benefit cost
                        
Service cost
   $
72
     $
85
     $
85
  
Interest cost
    
265
      
270
      
269
  
Amortization of prior service credit
    
(537
)
    
(537
)
    
(673
)
Amortization of accumulated loss
    
30
      
99
      
121
  
Net periodic benefit cost
   $
(170
)
   $
(83
)
   $
(198
)
                         
                         
Estimated amounts that will be amortized from accumulated other comprehensive loss over the next year
                        
Prior service credit
   $
537
     $
537
     $
537
  
Net loss
    
(83
)
    
(30
)
    
(99
)
    $
454
     $
507
     $
438
  
                         
                         
Healthcare cost trend rate assumed for next year
    
6.30
%
    
6.60
%
    
6.60
%
Rate to which the cost trend rate gradually declines
    
4.50
%
    
4.50
%
    
4.50
%
Year that the rate reaches the rate at which it is assumed to remain
  
2037
    
2037
    
2037
  
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block]
   
1% Increase
  
   
201
9
    
201
8
    
201
7
  
Effect on total of service and interest cost
   $
-
     $
-
     $
-
  
Effect on postretirement benefit obligation
    
1
      
1
      
2
  
   
1% Decrease
  
   
201
9
    
201
8
    
201
7
  
Effect on total of service and interest cost
   $
-
     $
-
     $
-
  
Effect on postretirement benefit obligation
    
(1
)
    
(1
)
    
(2
)
Schedule of Expected Benefit Payments [Table Text Block]
Fiscal Year
  
Pension
    
Other
Benefits
  
2020
   $
8,006
     $
354
  
2021
    
8,011
      
354
  
2022
    
8,134
      
358
  
2023
    
8,978
      
363
  
2024
    
8,373
      
353
  
2025-2029
    
53,635
      
2,228
  
    $
95,137
     $
4,010