Jaynne C. Keyes, a Cuomo appointee to the state arts council married to a former top aide to Mr. Cuomo’s father, gave Mr. Cuomo $20,000 on July 9. Days later, she followed that up with two more donations — for $5 each.

The cumulative effect of these donations was negligible: of the $6 million raised in the last six months, only 1 percent came from those donating $250 or less. All told, Mr. Cuomo earned more in interest payments on his campaign war chest (nearly $154,000) than he collected in total contributions from donors who gave less than $1,000 (just under $110,000).

“I think they’re experimenting with how to do this and you are always innovating and trying to figure out the best ways,” said Chris Coffey, a Democratic strategist who has given some informal advice to the Cuomo campaign. “I don’t know there is anything wrong with taking very small donations.”

On Monday, before releasing the full report, the Cuomo campaign had touted that 57 percent of his contributions were for $250 or less and his most common contribution was a mere $5. Ms. Nixon’s campaign on Tuesday accused the governor of running an “AstroTurf campaign,” and highlighted her more than 30,000 donations.

Overall, the filings reveal the depth of the challenge that lies ahead for Ms. Nixon, who trailed Mr. Cuomo in a recent public poll by 35 percentage points. She reported less than $660,000 cash-on-hand compared with Mr. Cuomo’s $31.1 million.

In fact, Mr. Cuomo’s report showed that so far he has spent more on television ads, $1.7 million, than Ms. Nixon has raised in total. He spent another $93,000 on polling.

Mr. Cuomo’s financial edge has only expanded in recent months, as he added large contributions from powerful institutional donors such as the New York A.F.L.-C.I.O. ($65,000), the state nurses association ($64,600), and Viacom Telecommunications LLC ($50,000). Billy Joel and Alexis Joel each reported $26,992 in in-kind contributions to Mr. Cuomo, as well, this month.