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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Operating activities:    
Net income $ 719,000 $ 1,352,000
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 392,000 401,000
Gain on sale of assets (9,000)
Stock-based compensation expense 83,000 54,000
Deferred tax (benefit) / expense (33,000) 3,000
Bad debt expense 17,000 40,000
Forgiveness of note payable from Paycheck Protection Program (1,037,000)
Changes in operating assets and liabilities:    
Accounts receivable 198,000 477,000
Inventory (110,000) (885,000)
Prepaid expenses and other assets (472,000) 106,000
Accounts payable 274,000 73,000
Accrued expenses and other current liabilities 897,000 519,000
Deferred revenue 309,000 521,000
Right of use assets and liabilities, net (4,000) 5,000
Net cash provided by operating activities 2,270,000 1,620,000
Investing activities:    
Purchase of digital assets (178,000)
Purchases of property, equipment and software development costs (29,000) (128,000)
Net cash used in investing activities (207,000) (128,000)
Financing activities:    
Repayments of finance lease obligations (6,000) (7,000)
Proceeds from stock option exercise 7,000 44,000
Stock repurchase under Stock Buyback Plan (1,070,000) (606,000)
Net cash used in financing activities (1,069,000) (569,000)
Net change in cash 994,000 923,000
Cash at beginning of period 5,414,000 4,374,000
Cash at end of period $ 6,408,000 $ 5,297,000