Commitments and Other - Additional Information (Detail)	1 Months Ended		3 Months Ended			9 Months Ended		12 Months Ended
	Aug. 31, 2013 USD ($)	Jan. 31, 2010 USD ($) Instruments	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($) Instruments	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) shares	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Long-term Purchase Commitment [Line Items]
Additional payment received by using technology						2.50%
Additional payment received by using other technology						5.00%
Annual service fee	$ 100,000
Period of shareholder agreement	3 years
Tricor Systems Inc [Member] | STA Instruments [Member]
Long-term Purchase Commitment [Line Items]
Issue of purchase order | Instruments		12,000
Delivery period		3 years
Purchase order		$ 5,261,640
Wand Dental Inc [Member] | STA Instruments [Member]
Long-term Purchase Commitment [Line Items]
Issue of purchase order | Instruments				3,000
Purchase order				$ 1,785,750
New purchase commitment, description						Wand Dental Inc, a wholly-owned subsidiary of Milestone Scientific was assigned this commitment on October 1, 2014. As of September 30, 2015, this commitment was completed. In the second quarter of 2015, Wand Dental Inc entered into a new purchase commitment for 3,000 STA instruments, ($1,785,750) for the delivery of these instruments beginning October 2015 and into 2016.
Advance made on purchase commitment order						$ 1,211,926		$ 721,197
Director [Member]
Long-term Purchase Commitment [Line Items]
Options to purchase common stock issued | shares						8,333
Director's royalty fees			$ 117,320		$ 89,600	$ 313,751	$ 291,714
Consulting fees						$ 0	$ 39,390