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Note 1 - Basis of Presentation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Decrease in Estimated Costs to Perform Obligations under Completed Contract Method [Member]
Net Income (Loss) Attributable to Parent	$ 900		$ 900
Earnings Per Share, Diluted	$ 0.03		$ 0.03
Other Noncurrent Liabilities [Member]
Deferred Revenue, Noncurrent	$ 200		$ 200		$ 300
Net Income (Loss) Attributable to Parent	$ 2,214	$ 2,149	$ 4,276	$ 8,116
Earnings Per Share, Diluted	$ 0.07	$ 0.07	$ 0.13	$ 0.25

The noncurrent portion of deferred revenue amount as of balance sheet date. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized, and is not expected to be recognized in the next twelve months. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

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