Note 10 - Leases - Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019		Dec. 31, 2018
Operating lease right-of-use assets	$ 1,628	$ 2,287
Property and equipment at cost	42,078			44,730
Less accumulated amortization	(28,548)			(30,577)
Property and equipment under finance lease, net	13,530			14,153
Current obligations of finance leases	227			204
Noncurrent obligations of finance leases	$ 559			676
Operating leases (Year)	4 years 62 days
Finance leases (Year)	3 years 204 days
Operating leases	4.81%
Finance leases	4.60%
Furniture and Equipment Held under Finance Leases [Member]
Property and equipment at cost	$ 802			1,062
Computer Equipment Held under Finance Leases [Member]
Property and equipment at cost	511			487
Computer Software Held under Finance Leases [Member]
Property and equipment at cost	207			224
Assets Held under Finance Leases [Member]
Property and equipment at cost	1,520			1,773
Less accumulated amortization	(734)			(839)
Property and equipment under finance lease, net	786			$ 934
Other Current Liabilities [Member]
Current operating lease liabilities	524	692	[1]
Other Noncurrent Liabilities [Member]
Operating lease obligations, net of current portion	1,139	1,639	[1]
Other Current Liabilities and Other Noncurrent Liabilities [Member]
Total operating lease liabilities	$ 1,663	$ 2,331

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