POWER OF ATTORNEY
For Executing Forms 3, 4 and 5 and 144

      Know all by these present, that the undersigned constitutes and appoints each of William
C. Hogoboom and Mark R. Busch, signing singly, his true and lawful attorney-in-fact to:


(1)  execute for and on behalf of the undersigned Forms 3, 4 and 5 in accordance
with Section 16(a) of the Securities Exchange Act of 1934 and the rules
thereunder;


(2)  execute for and on behalf of the undersigned notices on Form 144 in
accordance with Rule 144 under the Securities Act of 1933;


(3)  do and perform any and all acts for and on behalf of the undersigned which may
be necessary or desirable to complete the execution of any such Forms 3, 4 or 5
or Form 144 and the timely filing of such forms with the United States
Securities and Exchange Commission, any stock exchange or other authority;
and


(4)  take any other action of any type whatsoever in connection with the foregoing
which, in the opinion of such attorney-in-fact, may be of benefit to, in the best
interest of, or legally required by, the undersigned, it being understood that the
documents executed by such attorney-in-fact on behalf of the undersigned
pursuant to the Power of Attorney shall be in such form and shall contain such
terms and conditions as such attorney-in-fact may approve in his discretion.

      The undersigned hereby grants to each such attorney-in-fact full power and authority to
do and perform all and every act and thing whatsoever requisite, necessary and proper to be done
in the exercise of any of the rights and powers herein granted, as fully to all intents and purposes,
as the undersigned might or could do if personally present, with full power of substitution or
revocations and hereby ratifies and confirms all that such attorney-in-fact shall lawfully do or
cause to be done by virtue of this power of attorney and the rights and powers herein granted.
The undersigned acknowledges that the foregoing attorneys-in-fact, in serving in such capacity at
the request of the undersigned, are not assuming any of the undersigned's responsibilities to
comply with Section 16 of the Securities Exchange Act of 1934 and the rules thereunder or Rule
144 under the Securities Act of 1933.  This Power of Attorney shall be a durable power of
attorney and shall not be affected by subsequent disability or incapacity of the undersigned.

      IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as of this 10th day of august, 2011.


      						/s/ Jeffrey A. Reichard
						Jeffrey A. Reichard