Note 5 - Lease Obligations and Other Contingencies (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018	Dec. 31, 2017
Cumulative Effect of New Accounting Principle in Period of Adoption			$ 238,000	$ 1,126,000
Operating Lease, Weighted Average Remaining Lease Term	13 years 109 days
Operating Lease, Weighted Average Discount Rate, Percent	12.70%
Operating Lease, Expense	$ 1,464,000
Operating Lease, Payments	1,457,000
Operating Lease, Right-of-Use Asset, Accumulated Amortization	1,386
Accrued Liabilities, Current [Member]
Operating Lease, Liability, Current	1,377,000
Other Noncurrent Liabilities [Member]
Operating Lease, Liability, Noncurrent	3,406,000
Other Noncurrent Assets [Member]
Operating Lease, Right-of-Use Asset	$ 3,590,000
Minimum [Member]
Lessee, Operating Lease, Term of Contract	1 year
Maximum [Member]
Lessee, Operating Lease, Term of Contract	5 years
Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption			$ 238,000	$ 1,126,000
Accounting Standards Update 2016-02 [Member]
Operating Lease, Right-of-Use Asset		$ 3,621,000
Operating Lease, Liability, Total		4,822,000
Accounting Standards Update 2016-02 [Member] | Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption		$ 238,000