PS

*dḳḳ - to crush, to pound; to be ground finely, to be fine, minute (EDA II)

For the frequent in individual Semitic languages semantic shift ‘to be ground finely, to be fine, minute’ > ‘to be little, smalľ in Indo-European languages see Buck 1949, 880ff.

PWS
*dḳdḳ - to pound; to be fine, small

A variant root of *d attested in WS in both transitive and intransitive (adjectival) verbs as well as in derived nouns.  

Akkadian
duḳḳuḳu - D. to pulverize, to crash (AHw. 162, CAD D 190)

diḳḳu ‘small, meagre’ (CAD D 159 (only in PNs); CDA 60), duḳḳatu ‘powder’ (CAD D 190, hapax), daḳḳu ‘crashed, smalľ (AHw. 162, CAD D 107), daḳḳatu ‘smal amount’ (CAD D 107) and other words attested in lexical lists.

Ugaritic
dḳ - tiny; fine; weak (DUL 277)

See the discussion of the meaning in EDA II.

Phoenician
dḳt - pulverized, fine (DNWSI 257)
Hebrew
dḳḳ - to crush; to become fine through grinding (HALOT 229)

daḳ ‘thin; scarce; fine; small, soft’ (HALOT 229)

Official Aramaic
dḳḳ - fine (DNWSI 258)
Biblical Aramaic
dḳḳ - to be crushed into small pieces, to be ground up fine (HALOT 1855)
Jewish Palestinian Aramaic
dḳḳ - to crush (DJPA 154)

dḳyḳ ‘small, young’ (DJPA 154)

Jewish Babylonian Aramaic
dḳḳ - to grind, to pound, to beat (DJBA 348)
Mandaic
dḳḳ - to pound, to crush (MD 113)
Arabic
dqq - to break, to crush; to knock; to be thin, slender, small, minute, fine (Lane 895)

daqīq- ‘slender, fine; flour’, diqq- ‘slender, fine’ (Lane 896).

Geez
daḳaḳa - to crush, to pound, to make fine (CDG 140)

daḳḳa ‘to be small, thin, to be a child’, daḳiḳ ‘crushed, pounded; slight, thin, minor; young, child, son; children, little ones’ (CDG 140)

Tigre
däḳḳä - to grind (WTS 525)

däḳiḳ ‘minute’ (WTS 525)

Tigrinya
däḳäḳä - to be minute, attenuated; to grow thin and fine; to be pulverized, broken to bits (TED 2108)

däḳḳi ‘children’ (TED 2108)

Amharic
däḳḳäḳä - to beat, to thrash soundly; to be fine, minute (AED 1768)
Chaha
ṭäḳäḳä - to be ground finely (EDG 217)
Ezha
ṭäḳḳäḳä - to be ground finely (EDG 217)
Endegen
däḳäḳä - to be ground finely (EDG 217)
Ennemor
ṭäḳäḳä - to be ground finely (EDG 217)
Gyeto
ṭäḳäḳä - to be ground finely (EDG 217)
Muher
ṭäḳḳäḳä - to be ground finely (EDG 217)
Masqan
ṭäḳḳäḳä - to be ground finely (EDG 217)
Gogot
däḳḳäˀä - to be ground finely (EDG 217)
Soddo
däḳäḳä - to be ground finely (EDG 217)
Mehri
dəḳ - to pound (ML 69)
Jibbali
s̃ədḳéḳ - to be pounded, slowly smashed (JL 38)
Soqotri
dḳḳ - to become thin (LS 133)