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Provision For Income Taxes (Details 3) - USD ($)
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Non-current deferred tax assets (liabilities) arising from: Temporary differences -      
Accumulated depreciation and amortization $ (2,075,095) $ (2,896,058) $ (3,164,716)
Capital loss carry-forwards 0 52,632 136,198
Total non-current net deferred tax liabilities (2,075,095) (2,843,426) 3,028,518
Current deferred tax assets arising from:      
Capital loss carry-forward 8,620 0 0
Unrealized losses (gain) on investments 127,234 (7,589) (41,260)
Inventory 233,366 307,910 265,072
Allowance for doubtful accounts and discounts 39,120 21,750 10,875
Total current deferred tax assets 408,340 322,071 234,687
Net deferred tax liability $ (1,666,755) $ (2,521,355) $ (2,793,831)