Thanks, Chris. For the first quarter of 2021, net sales were $184.4 million and diluted earnings were $2.16 per share. For the comparable prior year period, net sales were $123.6 million and diluted earnings were $0.87 per share. The substantial increase in profitability for the first quarter was attributable to the 49% increase in sales and production, which resulted in favorable leveraging of fixed costs, including depreciation, engineering and other indirect labor expenses. Also, the significant reduction in sales, promotional and rebate activity and improved labor efficiencies.
The balance sheet. At April 3, 2021, our cash and short-term investments, which are invested in U.S. T-bills, totaled $146.1 million. Our current ratio was 3.5:1, and we had no debt.
At April 3, 2021, stockholders' equity was $288.5 million, which equates to a book value of $16.41 per share, of which $8.31 per share was cash and short-term investments.
Cash flows. During the first quarter of 2021, we generated $28 million of cash from operations. We reinvested $6 million of that back into the company in the form of capital expenditures. We estimate that 2021 capital expenditures will be approximately $20 million, predominantly related to new product development. Our ability to shift manufacturing equipment between cells and between facilities improves overall utilization and allow us for reduced capital investment.
Cash returned to shareholders. In the first quarter of 2021, we returned $12.5 million to our shareholders through the payment of dividends. Our Board of Directors declared an $0.86 per share quarterly dividend for shareholders of record as of May 17, 2021, payable on May 28, 2021. As a reminder, our quarterly dividend is approximately 40% of net income, and therefore, varies quarter-to-quarter.
That's the financial update for the first quarter. Chris?