Note 2 - Adoption of New Accounting Standard - Cumulative Effect of Adjustments for New Accounting Pronouncements on Consolidated Condensed Balance Sheet (Details) - USD ($)		Jun. 30, 2019		Jan. 01, 2019	Dec. 31, 2018
Other noncurrent assets	[1]	$ 3,107,000		$ 3,281,000	$ 2,146,000
Accrued and other current liabilities		29,976,000		28,706,000	28,166,000
Noncurrent operating lease liabilities		451,000		595,000	$ 0
Previous Accounting Guidance [Member]
Other noncurrent assets	[1]	2,103,000
Accrued and other current liabilities		29,423,000
Noncurrent operating lease liabilities		0
Adjustments for New Accounting Pronouncement [Member]
Other noncurrent assets	[1]	1,004,000	[2]	1,135,000
Accrued and other current liabilities		553,000		540,000
Noncurrent operating lease liabilities		$ 451,000		$ 595,000

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

[2] Operating lease assets balance at January 1, 2019.