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Note 14 - Income Taxes (Tables)
12 Months Ended
Aug. 31, 2018
Notes Tables  
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
    Fiscal Year Ended August 31,
    2018   2017
Current:        
Federal   $
    $
 
State    
1,000
     
62,000
 
Foreign    
671,000
     
754,000
 
     
672,000
     
816,000
 
Deferred:                
Federal    
477,000
     
(135,000
)
State    
24,000
     
(9,000
)
Foreign    
(297,000
)    
28,000
 
     
204,000
     
(116,000
)
    $
876,000
    $
700,000
 
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
    Fiscal Year Ended August 31,
    2018   2017
Tax computed at statutory rates   $
2,081,000
    $
1,591,000
 
State income tax, net of federal benefit    
25,000
     
53,000
 
Tax effect on equity in income of international joint ventures    
(1,903,000
)    
(1,998,000
)
Tax effect on dividends received from joint ventures and investment at carrying value    
     
3,159,000
 
Tax effect of foreign operations    
101,000
     
841,000
 
Deemed repatriation    
4,011,000
     
 
Foreign tax credit    
(3,783,000
)    
(3,680,000
)
Research and development credit    
(10,000
)    
(212,000
)
Valuation allowance    
(173,000
)    
989,000
 
Stock based compensation    
57,000
     
81,000
 
Non-controlling interest    
(103,000
)    
(143,000
)
Deferred rate change    
633,000
     
 
Other    
(60,000
)    
19,000
 
    $
876,000
    $
700,000
 
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
    August 31,
    2018   2017
Accrued compensation   $
430,600
    $
310,300
 
Inventory costs    
58,900
     
87,000
 
Accrued joint venture expenses    
     
15,200
 
Other accrued expenses    
63,700
     
74,000
 
Goodwill and other intangible assets    
695,800
     
1,317,700
 
Stock-based compensation    
197,500
     
241,600
 
Foreign tax credit carryforward    
5,789,600
     
6,105,700
 
Other credit and loss carryforwards    
3,241,200
     
3,473,100
 
Total deferred tax assets    
10,477,300
     
11,624,600
 
Valuation allowance    
(8,654,500
)    
(9,578,700
)
Total deferred tax assets after valuation allowance    
1,822,800
     
2,045,900
 
Property and equipment    
(124,600
)    
(206,000
)
Other    
(146,200
)    
(83,300
)
Total deferred tax liabilities    
(270,800
)    
(289,300
)
Net deferred tax assets   $
1,552,000
    $
1,756,600
 
Summary of Income Tax Contingencies [Table Text Block]
    Fiscal Year Ended August 31,
    2018   2017
Gross unrecognized tax benefits – beginning balance   $
250,000
    $
238,000
 
Gross decreases - prior period tax positions    
(12,000
)    
(4,000
)
Gross increases – current period tax positions    
4,000
     
16,000
 
Gross unrecognized tax benefits – ending balance   $
242,000
    $
250,000