Note 7 - Leases (Details Textual)	3 Months Ended
	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)
Lessee, Operating Lease, Number of Right-of-Use Leases	5
Lessee, Operating Lease, Number of Right-of-Use Leases, Subleased	1
Lessee, Operating Lease, Renewal Term (Year)	5 years
Operating Lease, Weighted Average Discount Rate, Percent	9.92%
Operating Lease, Weighted Average Remaining Lease Term (Year)	3 years 11 months 15 days
Lessee, Finance Lease, Number of Leases	0
Short-term Lease Commitment, Amount	$ 0
Operating Lease, Payments	$ 934,000	$ 237,000