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Note 12 - Subsequent Events (Details Textual) - Subsequent Event [Member] - USD ($)	Jul. 08, 2015	Jul. 01, 2015
Restricted Replacement Shares Member | The 2015 Plan [Member] | Vesting February 20, 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted	104
Restricted Replacement Shares Member | The 2015 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted	9,682
Staking Restricted Shares [Member] | The 2015 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted	26,930
Restricted Stock [Member] | The 2015 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted	36,612
The 2015 Plan [Member]
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	$ 13,930,866
Share Price	$ 380.50
Stock Repurchase Program, Authorized Amount		$ 250,000,000
Stock Repurchase Program, Number of Shares Authorized to be Repurchased		600,000

X

- Definition

Net number of non-option equity instruments granted to participants.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 718



-SubTopic 10



-Section 50



-Paragraph 2



-Subparagraph (c)(1)(iv)(1)



-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

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+ References

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 505



-SubTopic 10



-Section S99



-Paragraph 1



-Subparagraph (SX 210.3-04)



-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770



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-Publisher FASB



-Name Accounting Standards Codification



-Topic 505



-SubTopic 10



-Section 50



-Paragraph 2



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- Definition

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- Definition

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+ References

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