"small diary" is a correct and usable part of a sentence in written English.
It can be used when describing a physical diary that is small in size. For example: "I always keep a small diary in my bag to jot down any important appointments or reminders."
I created a small diary of visits to the stand.
He never used the name to her face, but it was how he referred to her in the small diary he kept.
Though "War in Val d'Orcia" is full of evocative description, hair-raising anecdotes, and beautifully rendered portraits of courage, this small diary, which ends on August 1st, with the birth of Origo's daughter Benedetta, is precise, brief, and without stylistic embellishment.
On a nearby desk lay a small diary he recently filled with affirmations and goals.
Participants were asked to use a small diary (15 × 21 cm) to record any film-related intrusions during 1 week following the film (e.g., Davies and Clark 1998; Holmes et al. 2004).
This series includes small diaries, appointment books, prayer calendars, and address books kept by Shaver and his wife, Pearl Shaver.
The small maroon diary belonged to Vu Dinh Doan, a Vietnamese soldier who was killed in a machine gun fight, according to defence officials.
One option is to keep a small personal diary in Chinese, where you write down simple things like a description of the weather, how you are feeling that day, or what you did.
The cost per contact was based on self-report of the average number of patients (9.1), and a smaller sample diary study of ECLOs reported an average number of 6 patients per day [ 21].
She was a matriarch from a gentler age, speaking softly, keeping track of appointments in a small red leather diary, writing letters in her own hand, reading biographies voraciously, and each week playing bridge, calling it her secret vice.
