Note 3 - Significant Accounting Policies and Recent Accounting Pronouncements	6 Months Ended
Jun. 30, 2018
Notes to Financial Statements
Significant Accounting Policies [Text Block]	3. Significant Accounting Policies and Recent Accounting Pronouncements We disclosed in Note 2 to our consolidated financial statements included in our Annual Report on Form 10 -K for the year ended December 31, 2017 those accounting policies that we consider significant in determining our results of operations and financial position. Other than as described below, there have been no material changes to, or in the application of, the accounting policies previously identified and described in the Form 10 -K. In May 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update 2014 - 09, Revenue from Contracts with Customers (ASU 2014 - 09 ), which creates a new Topic, Accounting Standards Codification Topic 606. The standard is principle-based and provides a five -step model to determine when and how revenue is recognized. The core principle is that an entity should recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. We adopted ASU 2014 - 09 effective January 1, 2018; such adoption had no material impact on our financial statements. In May 2017, the FASB issued Accounting Standards Update 2017 - 09, Scope of Modification Accounting (ASU 2017 - 09 ), which amends Accounting Standards Codification Topic 718, Compensation – Stock Compensation. ASU 2017 - 09 is an attempt to provide clarity and reduce both ( 1 ) diversity in practice and ( 2 ) cost and complexity when applying the guidance in Topic 718 to a change to the terms or conditions of a share-based payment award. We adopted ASU 2017 - 09 effective January 1, 2018; such adoption had no material impact on our financial statements. In June 2018, the FASB issued Accounting Standards Update 2018 - 07, Improvements to Nonemployee Share-Based Payment Accounting (ASU 2018 - 07 ), that expands the scope of Topic 718 to include share-based payment transactions for acquiring goods and services from nonemployees. The guidance is effective for fiscal years beginning after December 15, 2018, including interim reporting periods within that fiscal year. We are currently evaluating the impact of the adoption of ASU 2018 - 07 on our financial statements. There have been no other recent accounting pronouncements or changes in accounting pronouncements during the six months ended June 30, 2018, as compared to the recent accounting pronouncements described in our Annual Report on Form 10 -K for the fiscal year ended December 31, 2017, which we expect to have a material impact on our financial statements.

Significant Accounting Policies and Recent Accounting Pronouncements

We disclosed in Note

to our consolidated financial statements included in our Annual Report on Form

-K for the year ended

December 31, 2017

those accounting policies that we consider significant in determining our results of operations and financial position. Other than as described below, there have been

material changes to, or in the application of, the accounting policies previously identified and described in the Form

-K.

May 2014,

the Financial Accounting Standards Board (FASB) issued Accounting Standards Update

2014

09,

Revenue from Contracts with Customers

(ASU

2014

), which creates a new Topic, Accounting Standards Codification Topic

606.

The standard is principle-based and provides a

five

-step model to determine when and how revenue is recognized. The core principle is that an entity should recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. We adopted ASU

2014

effective

January 1, 2018;

such adoption had

material impact on our financial statements.

May 2017,

the FASB issued Accounting Standards Update

2017

09,

Scope of Modification Accounting

(ASU

2017

), which amends Accounting Standards Codification Topic

718,

Compensation – Stock Compensation. ASU

2017

is an attempt to provide clarity and reduce both (

) diversity in practice and (

) cost and complexity when applying the guidance in Topic

718

to a change to the terms or conditions of a share-based payment award. We adopted ASU

2017

effective

January 1, 2018;

such adoption had

material impact on our financial statements.

June 2018,

the FASB issued Accounting Standards Update

2018

07,

Improvements to Nonemployee Share-Based Payment Accounting

(ASU

2018

), that expands the scope of Topic

718

to include share-based payment transactions for acquiring goods and services from nonemployees. The guidance is effective for fiscal years beginning after

December 15, 2018,

including interim reporting periods within that fiscal year. We are currently evaluating the impact of the adoption of ASU

2018

on our financial statements.

There have been

other recent accounting pronouncements or changes in accounting pronouncements during the

six

months ended

June 30, 2018,

as compared to the recent accounting pronouncements described in our Annual Report on Form

-K for the fiscal year ended

December 31, 2017,

which we expect to have a material impact on our financial statements.