Income Taxes (Details 1) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets:
Allowance for doubtful accounts	$ 21,150	$ 69,898
Inventory allowances	314,101	246,425
Accrued liabilities	372,172	282,055
Unicap 263A adjustment	170,765	157,240
Net operating loss carryforwards	511,403	685,322
Alternative minimum tax credit carryforwards	0	398,162
State investment tax credit carryforward	22,448	10,912
Foreign tax credit carryforward	916,121	696,509
Other foreign tax items	44,394	50,747
Foreign net operating loss carryforwards	424,164	466,053
Total deferred tax assets	2,796,718	3,063,323
Deferred tax liabilities:
Tax over book basis of capital assets	(1,004,437)	(1,083,852)
Undistributed Earnings from Subsidiaries	0	(247,385)
Other foreign tax items	0	0
Net deferred tax assets before valuation allowance	1,792,281	1,732,086
Less: Valuation allowance	(45,000)	0
Net deferred tax assets	$ 1,747,281	$ 1,732,086