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Note 10 - Income Taxes - Deferred Tax Assets (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Deferred tax assets:      
Federal and state net operating loss carryforwards $ 523,808 $ 438,075  
Foreign tax credit and other credits 592,993 581,917  
Reserves and accruals 271,884 731,655  
Unicap 263A adjustment 126,944 170,765  
Other deferred tax assets 26,198 17,922  
Foreign and VIE net operating loss carryforwards 569,147 541,983  
Total gross deferred tax assets 2,110,974 2,482,317  
Deferred tax liabilities:      
Fixed assets and intangibles (273,746) (740,627)  
Deferred state income tax (103,055)  
Total gross deferred tax liabilities (376,801) (740,627)  
Less: valuation allowance (631,706) (45,000) $ (45,000)
Net deferred tax assets $ 1,102,467 $ 1,696,690