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Note 9 - Shareholders' Equity | 12 Months Ended
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Dec. 31, 2017
Notes to Financial Statements |
Stockholders' Equity Note Disclosure [Text Block] | Note 9 . Shareholders’ Equity Each share of Class A Common Stock is entitled to one vote and each share of Class B Common Stock is entitled to ten votes on all matters submitted to a vote of the shareholders. Except for the election of Avalon ’s Board of Directors, the Class A Common Stock and the Class B Common Stock vote together as a single class on all matters presented for a vote to the shareholders. However, with regard to the election of directors, for as long as the outstanding Class B Common Stock has more than 50% of the total outstanding voting power of all common stock, the holders of the Class A Common Stock, voting as a separate class, will elect the number of directors equal to at least 25% of the total Board of Directors and the holders of the Class B Common Stock, voting as a separate class, will elect the remaining directors. Thereafter, the holders of the Class A Common Stock ( one vote per share) and Class B Common Stock ( ten votes per share) will vote together as a single class for the election of directors. The holders of a majority of all outstanding shares of Class A Common Stock or Class B Common Stock, voting as separate classes, must also approve amendments to the Articles of Incorporation that adversely affect the shares of their class. Shares of Class A Common Stock and Class B Common Stock do not have cumulative voting rights. Each share of Class B Common Stock is convertible, at any time, at the option of the shareholder, into one share of Class A Common Stock. Shares of Class B Common Stock are also automatically converted into shares of Class A Common Stock on the transfer of such shares to any person other than Avalon, another holder of Class B Common Stock or a Permitted Transferee, as defined in Avalon ’s Articles of Incorporation. The Class A Common Stock is not convertible.

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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