Note 8 - Leases - Leases Information (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Amortization of finance lease assets		$ 150	$ 139	$ 435	$ 411
Interest on finance lease liabilities		64	27	139	81
Total finance lease costs		214	166	574	492
Operating lease cost		764	724	2,340	2,265
Short-term lease cost		196	166	483	470
Variable lease cost	[1]	198	185	586	570
Sublease income		(45)	(32)	(136)	(120)
Total operating lease costs		1,113	1,043	3,273	3,185
Total lease cost		$ 1,327	$ 1,209	3,847	3,677
Operating cash outflow from operating leases				$ 2,638	$ 2,626
Weighted-average remaining lease term-finance leases at end of period (in years) (Year)		1 year 255 days	1 year 36 days	1 year 255 days	1 year 36 days
Weighted-average remaining lease term-operating leases at end of period (in years) (Year)		10 years 73 days	10 years 292 days	10 years 73 days	10 years 292 days
Weighted-average discount rate-finance leases at end of period		8.90%	8.70%	8.90%	8.70%
Weighted-average discount rate-operating leases at end of period		8.90%	9.00%	8.90%	9.00%

[1] Variable lease costs consist primarily of taxes, insurance, utilities, and common area or other maintenance costs for the Company's leased facilities and equipment.