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Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($)
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Cash flows from operating activities:    
Net income (loss) $ 73,615 $ (2,002,484)
Adjustments to reconcile net income (loss) to net cash used in operating activities:    
Depreciation 920,228 969,958
Non-cash lease expense 50,592 0
Gain on disposal of assets, net (329,994) (36,886)
Deferred income taxes 0 485,739
Changes in operating assets and liabilities:    
Accounts receivable, net (1,754,313) (330,918)
Contract assets 38,351 118,301
Inventories, net 146,975 (77,129)
Other current assets (212,895) 87,886
Accounts payable (197,104) 471,337
Accrued wages and salaries 245,397 107,838
Other accrued liabilities 19,608 171,010
Unearned revenue and customer deposits (124,831) (301,047)
Other long-term liabilities (220,000) 243,000
Net cash used in operating activities (1,344,371) (93,395)
Cash flows from investing activities:    
Capital expenditures (239,618) (709,396)
Proceeds from the sale of assets 683,905 96,350
Proceeds from short-term investments 247,276 3,000,815
Purchases of short-term investments 0 (1,726,284)
Net cash provided by investing activities 691,563 661,485
Cash flows from financing activities:    
Proceeds from debt 500,000 0
Cash dividends paid (86,952) (289,840)
Net cash provided by (used in) financing activities 413,048 (289,840)
Net (decrease) increase in cash and cash equivalents (239,760) 278,250
Cash and cash equivalents at beginning of period 1,922,679 1,387,075
Cash and cash equivalents at end of period 1,682,919 1,665,325
Supplemental disclosure of cash flows information:    
Cash paid for income taxes, net of refunds received 45,000 (513,424)
Cash paid for interest 18,017 0
Non-cash investing and financing activities:    
Operating lease right-of-use asset obtained in exchange for operating lease liability $ 435,149 $ 0