Profitability? I thought this organization is Not For Profit.
Yet, as Kelly clarified, any excess of income over expenses is truly a "profit". In the case of for-profit organizations, it can be kept in reserve, used for acquisitions, or distributed to shareholders as dividends. In the case of a non-profit, it can be used under certain conditions for reserves or for expanded operations / acquisitions.
For example, were there any, a non-profit hospital that has excess money at the end of its fiscal year can use that to build a new wing, buy new high-cost equipment, as incentive for staff recruitment or they can reserve some for future needs or emergencies.
The business model doesn't work if listener donations aren't sufficient to fund all their projects. You can't buy more stations without money or Divine Intervention...
Obviously. However, if in one year they "overspend" to take advantage of opportunities, they can likely get a loan while donations increase due to those acquisitions to repay the loan. The main difference between a non-profit (charity, etc.) and a for-profit is that there are no shareholders who participate in the distribution of any excess revenue after expenses are paid.
My mother spent 60 years in the administration of non-profit health care organizations and from when I was about 7 she'd explain to me what was in the stacks of paper she brought home from her Board of Directors meetings. Often I'd sort papers, put them in folders and the like for her and I got a good handle on finance from her and my dad who was also in charge of a non-profit as a CEO (It worked: I built my own major market radio station at age 18 and it was immediately profitable!).