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Consolidated Statements of Equity - USD ($)
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Noncontrolling Interest [Member]
Total
BALANCE (in shares) at Aug. 31, 2012 4,403,656          
BALANCE at Aug. 31, 2012 $ 88,073 $ 11,130,966 $ 25,260,034 $ 277,583 $ 187,913 $ 36,944,569
Options exercised (in shares) 22,171         37,040
Exercise of stock options $ 444 207,910 $ 208,354
Stock issued for employee stock purchase plan (in shares) 6,209          
Stock issued for employee stock purchase plan $ 124 56,615 56,739
Stock option expense $ 306,451 306,451
Effect of subsidiary consolidation $ 3,960,920 3,960,920
Dividend received by non-controlling interest (1,752,842) (1,752,842)
Comprehensive income $ 3,366,894 $ 38,578 1,404,938 4,810,410
BALANCE (in shares) at Aug. 31, 2013 4,432,036          
BALANCE at Aug. 31, 2013 $ 88,641 $ 11,701,942 $ 28,626,928 $ 316,161 $ 3,800,929 $ 44,534,601
Repurchase of common stock (in shares)           0
Options exercised (in shares) 69,184         74,000
Exercise of stock options $ 1,384 478,076 $ 479,460
Stock issued for employee stock purchase plan (in shares) 3,332          
Stock issued for employee stock purchase plan $ 67 42,513 42,580
Stock option expense $ 454,015 454,015
Dividend received by non-controlling interest $ (1,440,000) (1,440,000)
Comprehensive income $ 4,106,372 $ (62,236) 1,444,813 5,488,949
BALANCE (in shares) at Aug. 31, 2014 4,504,552          
BALANCE at Aug. 31, 2014 $ 90,092 $ 12,676,546 $ 32,733,300 $ 253,925 3,837,257 49,591,120
Investment by non-controlling interest $ 31,515 $ 31,515
Repurchase of common stock (in shares)           0
Options exercised (in shares) 32,874         38,333
Exercise of stock options $ 657 $ 235,432 $ 236,089
Stock issued for employee stock purchase plan (in shares) 3,206          
Stock issued for employee stock purchase plan $ 64 57,917 57,981
Stock option expense $ 495,683 495,683
Dividend received by non-controlling interest $ (1,160,000) (1,160,000)
Comprehensive income $ 1,789,571 $ (3,434,736) 326,820 (1,318,345)
BALANCE (in shares) at Aug. 31, 2015 4,539,045          
BALANCE at Aug. 31, 2015 $ 90,781 $ 13,441,264 $ 34,522,871 $ (3,180,811) 3,019,702 47,893,807
Investment by non-controlling interest $ 15,625 $ 15,625
Repurchase of common stock (in shares) (1,587)         (1,587)
Repurchase of common stock $ (32) $ (24,314) $ (24,346)