Whether it's through stocks, bonds, ETFs, or other types of securities, all investors love seeing their portfolios score big returns. But for income investors, generating consistent cash flow from each of your liquid investments is your primary focus.While cash flow can come from bond interest or interest from other types of investments, income investors hone in on dividends. A dividend is that coveted distribution of a company's earnings paid out to shareholders, and investors often view it by its dividend yield, a metric that measures the dividend as a percent of the current stock price. Many academic studies show that dividends account for significant portions of long-term returns, with dividend contributions exceeding one-third of total returns in many cases.The First of Long Island in FocusThe First of Long Island (FLIC) is headquartered in Glen Head, and is in the Finance sector. The stock has seen a price change of 17.2% since the start of the year. The holding company for The First National Bank of Long Island is currently shelling out a dividend of $0.19 per share, with a dividend yield of 3.63%. This compares to the Banks - Northeast industry's yield of 2% and the S&P 500's yield of 1.33%.In terms of dividend growth, the company's current annualized dividend of $0.76 is up 4.1% from last year. Over the last 5 years, The First of Long Island has increased its dividend 5 times on a year-over-year basis for an average annual increase of 8.28%. Any future dividend growth will depend on both earnings growth and the company's payout ratio; a payout ratio is the proportion of a firm's annual earnings per share that it pays out as a dividend. Right now, The First of Long Island's payout ratio is 42%, which means it paid out 42% of its trailing 12-month EPS as dividend.FLIC is expecting earnings to expand this fiscal year as well. The Zacks Consensus Estimate for 2021 is $1.85 per share, with earnings expected to increase 2.78% from the year ago period.Bottom LineFrom greatly improving stock investing profits and reducing overall portfolio risk to providing tax advantages, investors like dividends for a variety of different reasons. It's important to keep in mind that not all companies provide a quarterly payout.High-growth firms or tech start-ups, for example, rarely provide their shareholders a dividend, while larger, more established companies that have more secure profits are often seen as the best dividend options. Income investors must be conscious of the fact that high-yielding stocks tend to struggle during periods of rising interest rates. With that in mind, FLIC is a compelling investment opportunity. Not only is it a strong dividend play, but the stock currently sits at a Zacks Rank of 3 (Hold). Breakout Biotech Stocks with Triple-Digit Profit Potential The biotech sector is projected to surge beyond $775 billion by 2024 as scientists develop treatments for thousands of diseases. They’re also finding ways to edit the human genome to literally erase our vulnerability to these diseases. Zacks has just released Century of Biology: 7 Biotech Stocks to Buy Right Now to help investors profit from 7 stocks poised for outperformance. Our recent biotech recommendations have produced gains of +50%, +83% and +164% in as little as 2 months. The stocks in this report could perform even better.See these 7 breakthrough stocks now>>Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report The First of Long Island Corporation (FLIC): Free Stock Analysis Report To read this article on Zacks.com click here.