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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Operating activities:    
Net income $ 1,504,000 $ 2,219,000
Adjustments to reconcile net income to net cash  provided by operating activities:    
Depreciation and amortization 583,000 601,000
Impairment of digital assets 42,000
Gain on sale of assets (9,000)
Stock-based compensation expense 102,000 222,000
Deferred tax benefit (59,000) (8,000)
Bad debt expense 40,000 45,000
Forgiveness of note payable from Paycheck Protection Program (1,037,000)
Changes in operating assets and liabilities:    
Accounts receivable (713,000) 135,000
Inventory (107,000) (870,000)
Prepaid expenses and other assets (682,000) 308,000
Accounts payable 503,000 247,000
Accrued expenses and other current liabilities 1,560,000 747,000
Deferred revenue 240,000 429,000
Right of use assets and liabilities, net (7,000) 4,000
Net cash provided by operating activities 3,006,000 3,033,000
Investing activities:    
Purchase of digital assets (178,000)
Purchases of property, equipment and software development costs (41,000) (176,000)
Net cash used in investing activities (219,000) (176,000)
Financing activities:    
Repayments of finance lease obligations (7,000) (7,000)
Proceeds from stock option exercise 19,000 45,000
Dividends paid to shareholders (914,000)
Stock repurchase under Stock Buyback Plan (2,207,000) (713,000)
Net cash used in financing activities (2,195,000) (1,589,000)
Net change in cash 592,000 1,268,000
Cash at beginning of period 5,414,000 4,374,000
Cash at end of period $ 6,006,000 $ 5,642,000