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Note 12 - Employee Benefit and Retirement Plans (Tables)
 12 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Allocation of Plan Assets [Table Text Block]
   
2018
    
2017
  
Asset category:
                
Cash equivalents
    
1
%
    
1
%
Fixed income
    
27
%
    
18
%
Equities
    
34
%
    
24
%
Mutual and pooled funds
    
38
%
    
57
%
     
100
%
    
100
%
Schedule of Portfolio By Valuation Category [Table Text Block]
June 30,
2018
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
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
%
June 30,
201
7
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Asset Category
  
Level 1
    
Level 2
    
Level 3
    
Total
    
%
  
Cash Equivalents
   $
780
     $
-
     $
-
     $
780
      
1
%
Fixed Income
    
-
      
21,128
      
-
      
21,128
      
18
%
Equities
    
26,580
      
1,709
      
-
      
28,289
      
24
%
Mutual & Pooled Funds
    
31,867
      
35,714
      
-
      
67,581
      
57
%
Total
   $
59,227
     $
58,551
     $
-
     $
117,778
      
100
%
Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block]
   
Fair Value Measurement Using
Significant Unobservable Inputs
(Level 3)
  
   
2018
    
2017
  
                 
Beginning balance
   $
-
     $
2,810
  
Actual returns on assets
    
-
      
-
  
Translation gain (loss)
    
-
      
-
  
Transferred out of Level 3
    
-
      
(2,810
)
                 
Ending balance
   $
-
     $
-
  
Schedule of Changes in Projected Benefit Obligations [Table Text Block]
   
201
8
    
2017
    
2016
  
Change in benefit obligation
                        
Benefit obligation at beginning of year
   $
169,696
     $
175,233
     $
166,189
  
Service cost
    
-
      
1,405
      
2,757
  
Interest cost
    
6,077
      
6,246
      
7,032
  
Plan curtailment
    
-
      
(4,170
)
    
-
  
Exchange rate changes
    
707
      
(909
)
    
(7,825
)
Benefits paid
    
(6,489
)
    
(6,902
)
    
(6,590
)
Actuarial (gain) loss
    
(10,778
)
    
(1,207
)
    
13,670
  
Benefit obligation at end of year
   $
159,213
     $
169,696
     $
175,233
  
                         
Change in plan assets
                        
Fair value of plan assets at beginning of year
    
117,778
      
115,015
      
122,787
  
Actual return on plan assets
    
2,545
      
5,302
      
226
  
Employer contributions
    
4,366
      
5,000
      
4,482
  
Benefits paid
    
(6,489
)
    
(6,902
)
    
(6,590
)
Exchange rate changes
    
493
      
(637
)
    
(5,890
)
Fair value of plan assets at end of year
    
118,693
      
117,778
      
115,015
  
Funded status at end of year
   $
(40,520
)
   $
(51,918
)
   $
(60,218
)
Amounts recognized in balance sheet
                        
Current liability
   $
(67
)
   $
(63
)
   $
(45
)
Noncurrent liability
    
(40,453
)
    
(51,855
)
    
(60,173
)
Net amount recognized in balance sheet
   $
(40,520
)
   $
(51,918
)
   $
(60,218
)
                         
Amounts not yet reflected in net periodic benefit costs and included in accumulated other comprehensive loss
                        
Prior service cost
   $
-
     $
-
     $
-
  
Accumulated loss
    
(4,038
)
    
(12,131
)
    
(17,849
)
Amounts not yet recognized as a component of net periodic benefit cost
    
(4,038
)
    
(12,131
)
    
(17,849
)
Accumulated net periodic benefit cost in excess of contributions
    
(36,482
)
    
(39,787
)
    
(42,369
)
Net amount recognized
   $
(40,520
)
   $
(51,918
)
   $
(60,218
)
                         
Components of net periodic benefit cost
                        
Service cost
   $
-
     $
1,405
     $
2,757
  
Interest cost
    
6,077
      
6,246
      
7,032
  
Expected return on plan assets
    
(5,140
)
    
(5,173
)
    
(6,268
)
Recognized actuarial loss
    
26
      
107
      
17,878
  
Net periodic benefit cost
   $
963
     $
2,585
     $
21,399
  
                         
Estimated amounts that will be amortized from accumulated other comprehensive loss over the next year
                        
Prior service cost
   $
-
     $
-
     $
-
  
Net loss
    
(28
)
    
(26
)
    
(114
)
                         
Information for pension plans with accumulated benefits in excess of plan assets
                        
Projected benefit obligation
   $
159,213
     $
169,696
     $
175,233
  
Accumulated benefit obligation
    
159,213
      
169,696
      
168,119
  
Fair value of assets
    
118,693
      
117,778
      
115,015
  
   
2018
    
2017
    
2016
  
Change in benefit obligation
                        
Benefit obligation at beginning of year
   $
124,138
     $
130,863
     $
116,398
  
Service cost
    
-
      
1,405
      
2,757
  
Interest cost
    
4,804
      
4,994
      
5,248
  
Plan curtailment
    
-
      
(4,170
)
    
-
  
Benefits paid
    
(4,786
)
    
(5,106
)
    
(4,593
)
Actuarial (gain) loss
    
(7,879
)
    
(3,848
)
    
11,053
  
Benefit obligation at end of year
   $
116,277
     $
124,138
     $
130,863
  
                         
Weighted average assumptions – benefit obligation
                        
Discount rate
    
4.27
%
    
3.92
%
    
3.77
%
Rate of compensation increase
    
n/a
    
Varies
    
Varies
  
                         
Change in plan assets
                        
Fair value of plan assets at beginning of year
   $
81,928
     $
81,910
     $
84,853
  
Actual return on plan assets
    
1,645
      
1,079
      
(1,730
)
Employer contributions
    
3,353
      
4,045
      
3,380
  
Benefits paid
    
(4,786
)
    
(5,106
)
    
(4,593
)
Fair value of plan assets at end of year
    
82,140
      
81,928
      
81,910
  
Funded status at end of year
   $
(34,137
)
   $
(42,210
)
   $
(48,953
)
                         
Amounts recognized in balance sheet
                        
Current liability
   $
(67
)
   $
(63
)
   $
(45
)
Noncurrent liability
    
(34,070
)
    
(42,147
)
    
(48,908
)
Net amount recognized in balance sheet
   $
(34,137
)
   $
(42,210
)
   $
(48,953
)
                         
Weighted average assumptions – net periodic benefit cost
                        
Discount rate
    
3.92
%
    
3.77
%
    
4.49
%
Rate of compensation increase
  
Varies
    
Varies
    
Varies
  
Return on plan assets
    
5.00
%
    
5.00
%
    
5.50
%
                         
Amounts not yet reflected in net periodic benefit cost and included in accumulated other comprehensive loss
                        
Prior service cost
   $
-
     $
-
     $
-
  
Accumulated loss
    
(2,731
)
    
(8,254
)
    
(13,412
)
Amounts not yet recognized as a component of net periodic benefit cost
    
(2,731
)
    
(8,254
)
    
(13,412
)
Accumulated contributions less than net periodic benefit cost
    
(31,406
)
    
(33,956
)
    
(35,541
)
Net amount recognized
   $
(34,137
)
   $
(42,210
)
   $
(48,953
)
                         
Components of net periodic benefit cost
                        
Service cost
   $
-
     $
1,405
     $
2,757
  
Interest cost
    
4,804
      
4,994
      
5,248
  
Expected return on plan assets
    
(4,026
)
    
(4,046
)
    
(4,589
)
Recognized actuarial loss
    
26
      
107
      
15,779
  
Net periodic benefit cost
   $
804
     $
2,460
     $
19,195
  
                         
Estimated amounts that will be amortized from accumulated other comprehensive loss over the next year
                        
Prior service cost
    
 
     $
-
     $
-
  
Net loss
    
(28
)
    
(26
)
    
(114
)
                         
Information for plan with accumulated benefits in excess of plan assets
                        
Projected benefit obligation
   $
116,277
     $
124,138
     $
130,863
  
Accumulated benefit obligation
    
116,277
      
124,138
      
123,749
  
Fair value of assets
    
82,140
      
81,928
      
81,910
  
   
2018
    
2017
    
2016
  
Change in benefit obligation
                        
Benefit obligation at beginning of year
   $
45,558
     $
44,370
     $
49,791
  
Interest cost
    
1,273
      
1,252
      
1,784
  
Exchange rate changes
    
707
      
(909
)
    
(7,825
)
Benefits paid
    
(1,703
)
    
(1,796
)
    
(1,997
)
Actuarial (gain) loss
    
(2,899
)
    
2,641
      
2,617
  
Benefit obligation at end of year
   $
42,936
     $
45,558
     $
44,370
  
                         
Weighted average assumptions - benefit obligation
                        
Discount rate
    
2.80
%
    
2.73
%
    
3.00
%
Rate of compensation increase
    
n/a
      
n/a
      
n/a
  
                         
Change in plan assets
                        
Fair value of plan assets at beginning of year
   $
35,850
     $
33,105
     $
37,934
  
Actual return on plan assets
    
900
      
4,223
      
1,956
  
Employer contributions
    
1,013
      
954
      
1,102
  
Benefits paid
    
(1,703
)
    
(1,796
)
    
(1,997
)
Exchange rate changes
    
493
      
(636
)
    
(5,890
)
Fair value of plan assets at end of year
    
36,553
      
35,850
      
33,105
  
Funded status at end of year
   $
(6,383
)
   $
(9,708
)
    
(11,265
)
Amounts recognized in balance sheet
                        
Current liability
   $
—
     $
—
     $
—
  
Noncurrent liability
    
(6,383
)
    
(9,708
)
    
(11,265
)
Net amount recognized in balance sheet
   $
(6,383
)
   $
(9,708
)
   $
(11,265
)
                         
Weighted average assumptions – net periodic benefit cost
                        
                         
Discount rate
    
2.73
%
    
3.00
%
    
3.90
%
Rate of compensation increase
    
n/a
      
n/a
      
n/a
  
Return on plan assets
    
3.01
%
    
3.59
%
    
4.77
%
                         
Amounts not yet reflected in net periodic benefit costs and included in accumulated other comprehensive loss
                        
Prior service cost
   $
—
     $
—
     $
—
  
Accumulated loss
    
(1,307
)
    
(3,877
)
    
(4,437
)
Amounts not yet recognized as a component of net periodic benefit cost
    
(1,307
)
    
(3,877
)
    
(4,437
)
Accumulated net periodic benefit cost in excess of contributions
    
(5,076
)
    
(5,831
)
    
(6,828
)
Net amount recognized
   $
(6,383
)
   $
(9,708
)
   $
(11,265
)
                         
Components of net periodic benefit cost
                        
Service cost
   $
—
     $
—
     $
—
  
Interest cost
    
1,273
      
1,252
      
1,784
  
Expected return on plan assets
    
(1,114
)
    
(1,127
)
    
(1,679
)
Amortization of net loss
    
—
      
—
      
2,099
  
Net periodic benefit cost
   $
159
     $
125
     $
2,204
  
                         
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
   $
42,936
     $
45,558
     $
44,370
  
Accumulated benefit obligation
    
42,936
      
45,558
      
44,370
  
Fair value of assets
    
36,553
      
35,850
      
33,105
  
Schedule of Medical and Life Insurance Benefits [Table Text Block]
   
2018
    
2017
    
2016
  
Change in benefit obligation:
                        
Benefit obligation at beginning of year
   $
7,086
     $
7,381
     $
6,611
  
Service cost
    
85
      
85
      
105
  
Interest cost
    
270
      
269
      
287
  
Benefits paid
    
(388
)
    
(483
)
    
(772
)
Actuarial (gain) loss
    
(668
)
    
(166
)
    
1,150
  
Benefit obligation at end of year
   $
6,385
     $
7,086
     $
7,381
  
                         
Weighted average assumptions: benefit obligations
                        
Discount rate
    
4.27
%
    
3.92
%
    
3.77
%
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
    
388
      
483
      
772
  
Benefits paid, net of employee contributions
    
(388
)
    
(483
)
    
(772
)
Fair value of plan assets at end of year
    
—
      
—
      
—
  
                         
Amounts recognized in balance sheet
                        
Current postretirement benefit obligation
   $
(338
)
   $
(370
)
   $
(396
)
Non-current postretirement benefit obligation
    
(6,047
)
    
(6,716
)
    
(6,985
)
Net amount recognized in balance sheet
   $
(6,385
)
   $
(7,086
)
   $
(7,381
)
                         
Weighted average assumptions – net periodic benefit cost
                        
Discount rate
    
3.92
%
    
3.77
%
    
4.49
%
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
   $
3,314
     $
3,851
     $
4,523
  
Accumulated gain (loss)
    
(928
)
    
(1,696
)
    
(1,983
)
Amounts not yet recognized as a component of net periodic benefit cost
    
2,386
      
2,155
      
2,540
  
Net periodic benefit cost in excess of accumulated contributions
    
(8,771
)
    
(9,241
)
    
(9,921
)
Net amount recognized
   $
(6,385
)
   $
(7,086
)
   $
(7,381
)
                         
Components of net periodic benefit cost
                        
Service cost
   $
85
     $
85
     $
105
  
Interest cost
    
270
      
269
      
287
  
Amortization of prior service credit
    
(537
)
    
(673
)
    
(781
)
Amortization of accumulated loss
    
99
      
121
      
15
  
Net periodic benefit cost
   $
(83
)
   $
(198
)
   $
(374
)
                         
                         
Estimated amounts that will be amortized from accumulated other comprehensive loss over the next year
                        
Prior service credit
   $
537
     $
537
     $
673
  
Net loss
    
(30
)
    
(99
)
    
(120
)
    $
507
     $
438
     $
553
  
                         
                         
Healthcare cost trend rate assumed for next year
    
6.60
%
    
6.60
%
    
6.90
%
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
8
    
201
7
    
201
6
  
Effect on total of service and interest cost
   $
-
     $
-
     $
-
  
Effect on postretirement benefit obligation
    
1
      
2
      
2
  
   
1% Decrease
  
   
201
8
    
201
7
    
201
6
  
Effect on total of service and interest cost
   $
-
     $
-
     $
-
  
Effect on postretirement benefit obligation
    
(1
)
    
(2
)
    
(2
)
Schedule of Expected Benefit Payments [Table Text Block]
Fiscal Year
  
Pension
    
Other
Benefits
  
2019
 
 
   $
7,192
     $
338
  
2020
 
 
    
7,405
      
342
  
2021
 
 
    
7,612
      
347
  
2022
 
 
    
7,971
      
355
  
2023
 
 
    
8,201
      
347
  
2024
-
2028
    
44,223
      
1,844