The components of deferred income tax assets and liabilities are as follows: (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Deferred Tax Assets:
Allowance for doubtful accounts	$ 56,884	$ 50,100
Credit carryforwards	1,758,809	1,435,543
Inventory reserve	307,456	423,605
Restricted stock	189,072	87,976
Other	18,654	15,237
Acquisition costs	93,063	100,774
Lease liability	940,230	934,463
Disallowed interest expense	891,345	791,785
Net operating loss carryforward	20,886,666	21,058,838
Deferred tax assets	25,142,179	24,898,321
Valuation allowance	(21,608,803)	(21,213,040)
Deferred Tax Liabilities:
Prepaid expenses	115,437	114,738
Revenue recognition	2,086,045	2,133,348
Property and equipment	452,384	593,678
Right of use asset	879,510	843,517
Deferred tax liabilities	3,533,376	3,685,281
Net deferred tax assets (liabilities)

The amount of deferred tax assets acquisition cost.

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The amount of deferred tax assets disallowed interest expense.

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The amount of deferred tax assets lease liability.

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The amount of deferred tax liabilities right of use asset.

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Amount of deferred tax liability attributable to taxable temporary differences.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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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 allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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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 a valuation allowances, of deferred tax assets attributable to deductible tax credit carryforwards including, but not limited to, research, foreign, general business, alternative minimum tax, and other deductible tax credit carryforwards.

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

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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 assets for which it is more likely than not that a tax benefit will not be realized.

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Amount of deferred tax consequences attributable to taxable temporary differences derived from prepaid expenses.

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

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Amount of deferred tax liability attributable to taxable temporary differences from tax deferred revenue or income classified as other.

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