Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Details
Depreciation and amortization	$ (988,334)	$ (1,432,275)
Inventory	149,460	240,647
Accrued vacation	70,973	110,246
Allowance for doubtful accounts	31,500	53,625
Other, net	(683)	(327)
Deferred Tax Assets and Liabilites	$ (737,084)	$ (1,028,084)

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from inventory.

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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.

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Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences, classified as other.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from compensated absences (includes, but not limited to, sick and personal days).

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from the allowance for doubtful accounts.

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Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment.

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