INCOME TAXES - Schedule of deferred tax assets and liabilities (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Accounts receivable	$ 72,900	$ 25,500
Inventory	29,000	29,100
Payroll differences	105,500	95,000
Net operating loss carryforwards	1,023,000	1,023,000
Less valuation allowance	(1,023,000)	(1,023,000)
Deferred tax assets, net	207,400	149,600
Deferred tax liabilites:
Depreciation	(436,000)	(70,900)
Deferred tax assets (liabilities), net	$ (228,600)	$ 78,700