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<br /> <br /> <br /> <br /> <br />NOTE C – CONCENTRATION OF CREDIT RISK (Continued) <br /> <br />The receivables represent unpaid billings from uncollateralized construction work. However, the Company <br />can place liens on projects that are unpaid. <br /> <br />NOTE D – MARKETABLE SECURITIES <br /> <br />Marketable securities have been classified according to management’s intent. The cost of securities and <br />their approximate level 1 fair values are as follows: <br /> <br /> December 31, 2023 <br /> Cost Basis <br />Gross <br />Unrealized <br />Gain (Loss) Fair Value <br /> <br />Marketable securities <br />available-for-sale 1,600,048 300,651 1,900,699 <br /> <br /> <br /> <br />Investments consist primarily of publicly traded mutual funds and shares of equity securities. <br /> <br />Realized gains (losses) from sales of securities available for sale are as follows <br /> <br /> December 31, 2023 <br /> <br />Proceeds <br />from Sales Cost Basis Gain (Loss) <br /> <br />Marketable securities <br />available-for-sale 331,512 294,783 36,729 <br /> <br /> <br />Management uses the specific identification method to determine the cost basis of securities sold. <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> 13 <br /> <br />