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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Operating activities    
Net income (loss) $ 2,345,000 $ (2,610,000)
Inventories allowances 6,000 (86,000)
Allowance for credit losses on accounts receivable 122,000 0
Amortization of deferred finance and other assets 50,000 76,000
Depreciation and amortization 821,000 777,000
Share-based compensation expense-stock options 132,000 119,000
Share-based compensation expense-restricted stock units 269,000 132,000
Loss on investments 91,000 489,000
Changes in operating assets and liabilities:    
Trade accounts receivable (3,748,000) 1,427,000
Inventories 2,355,000 (719,000)
Prepaid expenses and other current assets 364,000 195,000
Capitalized product development cost (430) 0
Other assets 34,000 (236,000)
ROU assets and lease liabilities (30,000) (24,000)
Accounts payable (1,037,000) (349,000)
Accrued compensation and related taxes 327,000 429,000
Accrued warranty expense 85,000 139,000
Deferred revenue 944,000 1,696,000
Accrued other expenses and other current liabilities 181,000 86,000
Net cash provided by operating activities 2,881,000 1,541,000
Investing activities    
Purchases of property, plant, and equipment (418,000) (918,000)
Net cash used in investing activities (418,000) (918,000)
Financing activities    
Proceeds from common stock issuance 0 50,000
Proceeds from the credit facility and notes payable 28,971,000 40,660,000
Repayment of the credit facility and notes payable (31,909,000) (40,563,000)
Net cash (used in) provided by financing activities (2,938,000) 147,000
Net change in cash and cash equivalents (475,000) 770,000
Cash and cash equivalents, beginning of period 3,456,000 1,918,000
Cash and cash equivalents, end of period 2,981,000 2,688,000
Supplemental disclosure    
Cash paid for interest 339,000 322,000
Non-cash financing activity    
Common stock issued under restricted stock units $ 108,000 $ 57,000