Note 3 - Revenues From Contracts With Customers Other Revenues (Details Textual) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Revenue from Contract with Customer, Including Assessed Tax	$ 8,243	$ 5,584
Contract with Customer, Liability, Total	0		$ 0
Contract with Customer, Asset, Credit Loss Expense	0		0
Contract with Customer, Asset, Net, Total	0		0
Transferred at Point in Time [Member]
Revenue from Contract with Customer, Including Assessed Tax	8,218	5,584
Transferred at Point in Time [Member] \| Variable Consideration or Multiple Performance Obligations [Member]
Revenue from Contract with Customer, Including Assessed Tax	0	0
Revenue, Remaining Performance Obligation, Amount	0		0
Transferred over Time [Member]
Revenue from Contract with Customer, Including Assessed Tax	25
Transferred over Time [Member] \| Variable Consideration or Multiple Performance Obligations [Member]
Revenue from Contract with Customer, Including Assessed Tax	0	$ 0
Revenue, Remaining Performance Obligation, Amount	$ 0		$ 0

Amount of credit loss recognized for write-down of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

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Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

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