Note 8 - Leases (Details Textual)		1 Months Ended		3 Months Ended
	Mar. 31, 2021 USD ($)	Jun. 30, 2021 USD ($)	Oct. 31, 2020 USD ($)	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)	Oct. 01, 2020	Feb. 01, 2017 USD ($) ft²
Operating Lease, Expense				$ 69,000	$ 73,000
Operating Lease, Weighted Average Remaining Lease Term (Year)				24 years
Operating Lease, Weighted Average Discount Rate, Percent				12.50%
Sublease Agreement for Relocation of Headquarters [Member]
Area of Real Estate Property (Square Foot) | ft²							12,400
Lessee, Operating Lease, Term of Contract (Month)							36 months
Operating Leases, Monthly Rent Per Rentable Square Foot During First Year							20.50
Operating Leases, Monthly Rent Per Rentable Square Foot During Second Year							21.12
Operating Leases, Monthly Rent Per Rentable Square Foot During Third Year							21.75
Security Deposit							$ 22,000
Operating Leases, Allowance for Certain Improvements							$ 88,000
Lessee, Operating Lease, Renewal Term (Month)	34 months				34 months
Lessee, Operating Lease, Rent Abatement		$ 19,000
Sublease Agreement for Relocation of Headquarters First Year Extension [Member]
Lessee, Operating Lease, Monthly Gross Rent	$ 21,027.88
Sublease Agreement for Relocation of Headquarters Second Year Extension [Member]
Lessee, Operating Lease, Monthly Gross Rent	21,643.03
Sublease Agreement for Relocation of Headquarters Third Year Extension [Member]
Lessee, Operating Lease, Monthly Gross Rent	$ 22,258.18
Noncancelable Operating Lease Agreement for Office Equipment [Member]
Lessee, Operating Lease, Term of Contract (Month)						36 months
Operating Leases, Monthly Payment			$ 2,000
Leases of Viveve Systems [Member]
Property, Plant, and Equipment, Lessor Asset under Operating Lease, after Accumulated Depreciation, Total				$ 459,000
Depreciation, Lessor Asset under Operating Lease				$ 58,000	$ 110,000