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INCOME TAXES - Deferred tax assets and liabilities (Details) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets:    
Intangible assets $ 295,000 $ 269,000
Bad debt expense 41,000 21,000
Accrued compensation expense 15,000 83,000
Deferred revenue and costs   2,000
Stock-based compensation 1,789,000 1,494,000
Operating lease liability 255,000 193,000
State NOL carryforwards 3,122,000 2,516,000
Federal NOL carryforwards 12,299,000 8,954,000
Total Deferred Tax Assets 17,816,000 13,532,000
Valuation allowance (17,319,000) (13,304,000)
Net deferred tax assets 497,000 228,000
Deferred tax liabilities:    
Property and equipment (270,000) (62,000)
Deferred revenue and costs (8,000)  
Right of use assets (219,000) (166,000)
Total deferred tax liabilities (497,000) (228,000)
Net deferred tax asset (liability) $ 0 $ 0