Note 1 - Nature of Operations and Summary of Significant Accounting and Reporting Policies (Details Textual) $ / shares in Units, $ in Millions	Oct. 11, 2016 USD ($) $ / shares shares	Sep. 30, 2017 shares	Dec. 31, 2016 shares
Stock Issued During Period, Shares, New Issues	1,879,484
Stock Issued During Period, Shares, Employee Stock Purchase Plans	150,358
Shares Issued, Price Per Share | $ / shares	$ 10
Stock Issued During Period, Value, New Issues | $	$ 18.8
Payments of Stock Issuance Costs | $	$ 1.3
Stockholders' Equity Note, Stock Split, Conversion Ratio	2.0473
Conversion of Stock, Shares Issued	1,558,706
Common Stock, Shares, Outstanding	3,438,190	3,443,922	3,438,190
Equity Method Investment, Ownership Percentage	100.00%