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Note 1 - Basis of Presentation (Details Textual) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Impact of Estimates Revisions on Net Income	$ 0.6
Impact of Estimates Revisions on Earnings per Share, Diluted	$ 0.01
Deferred Pre-contract Costs	$ 0.6	$ 0.5
Other Noncurrent Liabilities [Member]
Deferred Revenue, Noncurrent	$ 1.7	$ 1.5

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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