Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations (continued)
Stock compensation expense
Included in total expenses were noncash stock-based compensation costs of $43,980 and $45,090 for the three months ended March 31, 2024 and 2023, respectively. Compensation expense for all stock-based awards is based on the grant date fair value and recognized over the required service (vesting) period. There was no unrecognized non-cash stock-based compensation expense at March 31, 2024.
Interest
Interest income, net was $87,056, and $48,977 for the three months ended March 31, 2024 and 2023, respectively. The increase was primarily due to higher cash and approximately $2.0 million of investments in marketable securities which benefited from an overall increase in interest rates. Interest expense related to finance lease obligations was $447 and $1,486 for the three months ended March 31, 2024, and 2023, respectively.
Income taxes
Income tax expense was $160,000, and $158,210 for the three months ended March 31, 2024, and 2023, respectively. The effective tax rate was 22.7% for the three months ended March 31, 2024 and 2023. The deferred tax asset was $0, and the deferred tax liability was $146,391 at March 31, 2024. The deferred tax asset was $0, and the deferred tax liability was $69,846 at December 31, 2023.
Net income
Net income for the three months ended March 31, 2024, and 2023, was $545,324, and $538,020, respectively. Higher gross profit and interest income was offset by an increase in operating expenses.
Liquidity and Capital Resources
Cash and cash equivalents
As of March 31, 2024, cash on hand was $5,465,327 compared to $5,673,994 at December 31, 2023. The slight decrease was primarily due to the investment of $176,534 of production equipment.
Working capital
At March 31, 2024, working capital was $7,736,858 compared to $7,633,016 at December 31, 2023, an increase of $103,842, or 1.4%. Cash decreased $208,667, accounts receivable-trade increased $213,135, inventories decreased $969,357, prepaid purchase orders decreased $1,106,146 and customer deposits decreased $2,442,538.
Cash from operations
Net cash used in operating activities during the three months ended March 31, 2024, was $11,694 and net cash provided by operating activities was $719,764 for the three months ended March 31, 2023. In addition to the net income generated in each period, this included depreciation and amortization of $126,777, and $115,591, and noncash stock-based compensation costs of $43,980 and $45,090 for the three months ended March 31, 2024, and 2023, respectively. The changes in inventories, accounts receivable, prepaid purchase orders and customer deposits compared to December 31, 2023, were related to the increase in shipments and orders received during the first three months of 2024. Orders remain strong as customers continue to monitor inventory very closely with continued emphasis on intra-quarter shipments.