3 - Income Taxes: Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Details
Depreciation and amortization	$ (1,295,804)	$ (1,171,948)
Inventory	175,739	122,629
Accrued vacation	70,787	74,385
Allowance for doubtful accounts	38,250	31,500
Other, net	(56)	350
Deferred Tax Assets and Liabilities	$ (1,011,084)	$ (943,084)

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

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-Name Accounting Standards Codification
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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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