Note 8 - Leases (Details Textual) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Lessee, Operating Lease, Number of Right-of-Use Leases		6
Lessee, Operating Lease, Number of Right-of-Use Leases, Subleased		1
Lessee, Operating Lease, Number Leases Exceeding One Year		3
Lessee, Operating Lease, Renewal Term (Year)		5 years
Operating Lease, Weighted Average Discount Rate, Percent		9.94%
Operating Lease, Weighted Average Remaining Lease Term (Year)		4 years 25 days
Lessee, Finance Lease, Number of Leases		0
Short-term Lease Commitment, Amount		$ 0
Operating Lease, Payments		$ 1,111,000	$ 983,000	$ 875,000
Operating Lease, Impairment Loss	$ 253,000