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Consolidated Statements of Shareholders' Equity - USD ($)
$ in Thousands
Common Stock [Member]
Class A [Member]
Common Stock [Member]
Class A [Member]
As Previously Reported [Member]
Common Stock [Member]
Class A [Member]
Cumulative Effect of Restatement Adjustments [Member]
Common Stock [Member]
Class B [Member]
Common Stock [Member]
Class B [Member]
As Previously Reported [Member]
Common Stock [Member]
Class B [Member]
Cumulative Effect of Restatement Adjustments [Member]
Capital in Excess of Par Value [Member]
Capital in Excess of Par Value [Member]
As Previously Reported [Member]
Capital in Excess of Par Value [Member]
Cumulative Effect of Restatement Adjustments [Member]
Retained Earnings [Member]
Retained Earnings [Member]
As Previously Reported [Member]
Retained Earnings [Member]
Cumulative Effect of Restatement Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
As Previously Reported [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Cumulative Effect of Restatement Adjustments [Member]
Treasury Stock [Member]
Treasury Stock [Member]
As Previously Reported [Member]
Treasury Stock [Member]
Cumulative Effect of Restatement Adjustments [Member]
Noncontrolling Interest [Member]
Noncontrolling Interest [Member]
As Previously Reported [Member]
Noncontrolling Interest [Member]
Cumulative Effect of Restatement Adjustments [Member]
Total
As Previously Reported [Member]
Cumulative Effect of Restatement Adjustments [Member]
Balance at Jul. 31, 2015 $ 30 $ 30 $ 0 $ 14 $ 14 $ 0 $ 17,644 $ 16,575 $ 1,069 $ 23,079 $ 23,246 $ (167) $ (1,509) $ (1,726) $ 217 $ (1,224) $ (1,224) $ 0 $ 2,629 $ 3,571 $ (942)      
Balance (in shares) at Jul. 31, 2015 3,023,206 3,023,206 0 1,370,519 1,370,519 0                   107,046 107,046 0            
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                
Net income (loss) $ 0     $ 0     0     741     0     $ 0     (587)     $ 154 $ 608 $ (202)
Foreign currency translation adjustments 0     0     0     0     (441)     0     (166)     (607) (557) 0
Cash dividends declared 0     0     0     (1,895)     0     0     0     (1,895)    
Unrealized investment (losses) gains, net 0     0     0     0     21     0     0     21 21 0
Conversion of Class B common stock to Class A common stock $ 0     $ 0     0     0     0     0     0          
Conversion of Class B common stock to Class A common stock (in shares) 12,572     (12,572)                                        
Issuance of stock under stock award plan $ 0     $ 0     (6)     0     0     $ 52     0          
Issuance of stock under stock award plan (in shares)                               (4,533)                
Share-based compensation expense 0     0     28     0     0     $ 0     0          
Distributions to noncontrolling interests 0     0     0     0     0     0     (345)          
Sale of majority-owned subsidiary 0     0     0     0     0     0     (310)          
Stock award plan forfeitures 0     0     0     0     0     $ 0     0          
Stock award plan forfeitures (in shares)                               1,560                
Balance at Jul. 31, 2016 $ 30     $ 14     17,666     21,925     (1,929)     $ (1,172)     1,221          
Balance (in shares) at Jul. 31, 2016 3,035,778     1,357,947                       104,073                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                
Net income (loss) $ 0     $ 0     0     2,823     0     $ 0     (312)     2,511 2,953 (252)
Foreign currency translation adjustments 0     0     0     0     152     0     22     174 230 0
Cash dividends declared 0     0     0     (1,719)     0     0     0     (1,719)    
Unrealized investment (losses) gains, net 0     0     0     0     (18)     0     0     (18) (18) 0
Issuance of stock under stock award plan 0     0     (90)     0     0     $ 135     0          
Issuance of stock under stock award plan (in shares)                               (11,952)                
Tax impact of share based compensation 0     0     (6)     0     0     $ 0     0          
Tax impact of noncontrolling interests 0     0     0     (24)     0     0     24          
Distributions to noncontrolling interests 0     0     0     0     0     0     (8)          
Balance at Jul. 31, 2017 $ 30     $ 14     17,570     23,005     (1,795)     $ (1,037)     947     38,734 $ 39,808 $ (540)
Balance (in shares) at Jul. 31, 2017 3,035,778     1,357,947                       92,121                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                
Net income (loss) $ 0     $ 0     0     (308)     0     $ 0     204     (104)    
Foreign currency translation adjustments 0     0     0     0     (70)     0     (15)     (85)    
Cash dividends declared 0     0     0     (1,724)     0     0     0     (1,724)    
Unrealized investment (losses) gains, net 0     0     0     0     (20)     0     0     (20)    
Conversion of Class B common stock to Class A common stock $ 0     $ 0     0     0     0     0     0          
Conversion of Class B common stock to Class A common stock (in shares) 6,133     (6,133)                                        
Issuance of stock under stock award plan $ 0     $ 0     (130)     0     0     $ 130     0          
Issuance of stock under stock award plan (in shares)                               (11,531)                
Share-based compensation expense 0     0     127     0     0     $ 0     0          
Distributions to noncontrolling interests 0     0     0     0     0     0     (455)          
Sale of majority-owned subsidiary 0     0     (9)     0     0     0     0          
Purchase of additional noncontrolling interests 0     0     0     0     0     0     (17)          
Balance at Jul. 31, 2018 $ 30     $ 14     $ 17,558     $ 20,973     $ (1,885)     $ (907)     $ 664     $ 36,447    
Balance (in shares) at Jul. 31, 2018 3,041,911     1,351,814                       80,590