Note 10 - Leases - Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019		Dec. 31, 2018
Operating ROU assets	$ 1,805	$ 2,308
Current operating lease liabilities	589	699	[1]
Operating lease obligations, net of current portion	1,248	1,652	[1]
Total operating lease liabilities	1,837	$ 2,351
Property and equipment under finance lease, gross	48,245			44,730
Less accumulated amortization	(34,549)			(30,577)
Property and equipment under finance lease, net	13,696			14,153
Current obligations of finance leases	235			204
Noncurrent obligations of finance leases	629			676
Total finance lease liabilities	$ 864			880
Operating leases (Year)	4 years 80 days
Finance leases (Year)	3 years 281 days
Operating leases	4.81%
Finance leases	4.68%
Furniture and Equipment Held under Finance Leases [Member]
Property and equipment under finance lease, gross	$ 1,095			1,062
Computer Equipment Held under Finance Leases [Member]
Property and equipment under finance lease, gross	551			487
Computer Software Held under Finance Leases [Member]
Property and equipment under finance lease, gross	224			224
Assets Held under Finance Leases [Member]
Property and equipment under finance lease, gross	1,870			1,773
Less accumulated amortization	(959)			(839)
Property and equipment under finance lease, net	$ 911			$ 934

[1] Represents the December 31, 2018 balance recorded at implementation of Topic 842