Note 9 - Leases - Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Operating ROU assets	$ 1,460	$ 1,628	[1]
Current operating lease liabilities	476	524
Property and equipment under finance lease, gross	42,442	42,078
Less accumulated amortization	(29,787)	(28,548)
Property and equipment under finance lease, net	12,655	13,530
Current obligations of finance leases	224	227
Noncurrent obligations of finance leases	502	559
Total finance lease liabilities	$ 726	$ 786
Operating leases (Year)	4 years 40 days
Finance leases (Year)	3 years 124 days
Operating leases	4.79%
Finance leases	4.54%
Other Current Liabilities [Member]
Current operating lease liabilities	$ 476	$ 524	[1]
Other Noncurrent Liabilities [Member]
Operating lease obligations, net of current portion	1,014	1,139	[1]
Other Current Liabilities and Other Noncurrent Liabilities [Member]
Total operating lease liabilities	1,490	1,663	[1]
Furniture and Equipment Held under Finance Leases [Member]
Property and equipment under finance lease, gross	802	802
Computer Equipment Held under Finance Leases [Member]
Property and equipment under finance lease, gross	511	511
Computer Software Held under Finance Leases [Member]
Property and equipment under finance lease, gross	207	207
Assets Held under Finance Leases [Member]
Property and equipment under finance lease, gross	1,520	1,520
Less accumulated amortization	(795)	(734)
Property and equipment under finance lease, net	$ 725	$ 786

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