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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Cash flows from operating activities    
Net Income (loss) $ (555,863) $ (1,894,643)
Adjustments to reconcile net loss to net cash used in operating activities    
Depreciation 645,423 612,107
Gain on disposal of equipment (36,886) (31,500)
Deferred income taxes (165,718) (84,000)
Changes in operating assets and liabilities    
Accounts receivable (1,117,070) (929,264)
Contract assets 118,301 0
Inventories 389,959 (302,013)
Other current assets 442,034 (475,252)
Accounts payable 113,238 537,088
Accrued wages and salaries 56,683 115,325
Other accrued expenses 179,129 (243,717)
Unearned revenue and customer deposits (104,448) 331,781
Net cash used in operating activities (35,218) (2,364,088)
Cash flows from investing activities    
Capital expenditures (398,663) (760,248)
Proceeds from the sale of equipment 96,350 31,500
Proceeds from short-term investments 2,508,597 997,000
Purchases of short-term investments (1,479,275) 0
Net cash provided by investing activities 727,009 268,252
Cash flows from financing activities    
Cash dividends paid (193,226) (425,098)
Net cash used in financing activities (193,226) (425,098)
Net increase (decrease) in cash and cash equivalents 498,565 (2,520,934)
Cash and cash equivalents at beginning of period 1,387,075 4,045,101
Cash and cash equivalents at end of period $ 1,885,640 $ 1,524,167