Note 9 - Borrowings (Details Textual) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Long-term Federal Reserve Bank Advances	$ 48,834	$ 0

Including both current and noncurrent portions, Federal Reserve Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer.

No definition available.

Name:	qnto_LongtermFederalReserveBankAdvances
Namespace Prefix:	qnto_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant