Note 2 - Cash, Cash Equivalents and Marketable Investments (Details Textual) - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale, Net Accumulated Gross Unrealized Gain (Loss), before Tax	$ 1,000	$ 0

Amount, before tax, of net unrealized gain (loss) in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

No definition available.

Name:	cutr_DebtSecuritiesAvailableforsaleNetAccumulatedGrossUnrealizedGainLossBeforeTax
Namespace Prefix:	cutr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant