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Income Taxes (Details 1) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Deferred tax assets:    
Allowance for doubtful accounts $ 16,014 $ 21,150
Inventory allowances 312,592 314,101
Accrued liabilities 403,049 372,172
Unicap 263A adjustment 170,765 170,765
Net operating loss carryforwards 438,075 511,403
Alternative minimum tax credit carryforwards 0 0
State investment tax credit carryforward 22,448 22,448
Foreign tax credit carryforward 559,469 916,121
Other foreign tax items 17,922 44,394
Foreign net operating loss carryforwards 541,983 424,164
Total deferred tax assets 2,482,317 2,796,718
Deferred tax liabilities:    
Tax over book basis of capital assets (740,627) (1,004,437)
Undistributed Earnings from Subsidiaries 0 0
Other foreign tax items 0 0
Net deferred tax assets before valuation allowance 1,741,690 1,792,281
Less: Valuation allowance (45,000) (45,000)
Net deferred tax assets $ 1,696,690 $ 1,747,281