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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Operating activities |  |
Net loss | $ (11,633,000) | $ (1,701,000)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Allowance for doubtful accounts | 170,000 | 0
Inventory allowance | 81,000 | 700,000
Deferred tax expense | 0 | 184,000
Depreciation and amortization | 1,423,000 | 1,394,000
Share-based compensation expense -stock options | 271,000 | 253,000
Share-based compensation expense-restricted stock units | 404,000 | 306,000
Unrealized loss on investment | 313,000 | 219,000
(Gain) on sale of equipment | (1,000) | (40,000)
Changes in operating assets and liabilities: |  |
Trade accounts receivable | (2,557,000) | (1,763,000)
Inventories | (5,208,000) | (7,133,000)
Prepaid expenses and other current assets | 56,000 | 244,000
Other assets | (45,000) | 14,000
ROU Assets and Lease Liabilities | (38,000) | (23,000)
Accounts payable | 7,015,000 | 764,000
Accrued compensation and related taxes | 44,000 | (536,000)
Accrued warranty expense | 58,000 | (258,000)
Deferred revenue | 884,000 | 443,000
Accrued other expenses and other current liabilities | (237,000) | 631,000
Net cash used in operating activities | (9,000,000) | (6,302,000)
Investing activities |  |
Proceed from the sale of property, plant, and equipment | 0 | 72,000
Purchases of property, plant and equipment | (1,750,000) | (2,416,000)
Net cash used in investing activities | (1,750,000) | (2,344,000)
Financing activities |  |
Proceeds from issuance of common stock, net of costs | 0 | 11,559
Dividends paid | (2,029,000) | (1,172,000)
Proceeds from credit facility and notes payable | 9,722,000 | 5,743,000
Repayment of credit facility and notes payable | (5,605,000) | (3,730,000)
Net cash provided by financing activities | 2,088,000 | 12,400,000
Net change in cash and cash equivalents | (8,662,000) | 3,754,000
Cash and cash equivalents, beginning of year | 10,580,000 | 6,826,000
Cash and cash equivalents, end of year | 1,918,000 | 10,580,000
Supplemental disclosure |  |
Interest paid | 190,000 | 53,000
Non-cash financing activity |  |
Common Stock issued under restricted stock units | $ 364,000 | $ 298,000

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