Note 2 - Adoption of New Accounting Standard - Cumulative Effect of Adjustments for New Accounting Pronouncements on Consolidated Condensed Balance Sheet (Details) - USD ($) $ in Thousands	Sep. 30, 2019		Jan. 01, 2019	Dec. 31, 2018
Other noncurrent assets	$ 3,204		$ 3,281	$ 2,146
Accrued and other current liabilities	26,506		28,706
Noncurrent operating lease liabilities	714		595	0
Previous Accounting Guidance [Member]
Other noncurrent assets	2,027			2,146
Accrued and other current liabilities	26,043			28,166
Noncurrent operating lease liabilities	0			$ 0
Adjustments for New Accounting Pronouncement [Member]
Other noncurrent assets	1,177	[1]	1,135
Accrued and other current liabilities	463		540
Noncurrent operating lease liabilities	$ 714		$ 595

[1] Operating lease assets balance at September 30, 2019.