Note 3 - Revenues From Contracts With Customers Other Revenues (Details Textual) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Revenue from Contract with Customer, Including Assessed Tax	$ 9,420	$ 7,499	$ 17,663	$ 13,082
Contract with Customer, Liability, Total	0		0		$ 0
Contract with Customer, Asset, Credit Loss Expense			0		0
Contract with Customer, Asset, Net, Total	0		0		0
Transferred at Point in Time [Member]
Revenue from Contract with Customer, Including Assessed Tax	9,420	7,499	17,638	13,082
Transferred at Point in Time [Member] \| Variable Consideration or Multiple Performance Obligations [Member]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0	0
Revenue, Remaining Performance Obligation, Amount	0		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	0	$ 0
Revenue, Remaining Performance Obligation, Amount	$ 0		$ 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, after allowance for credit loss, 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 obligation to transfer good or service to customer for which consideration has been received or is receivable.

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

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