Balance Sheets (Parentheticals) - USD ($) $ / shares in Thousands	Dec. 31, 2016	Dec. 31, 2015
Common stock, par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized (in shares)	3,000,000	3,000,000
Common stock, shares issued (in shares)	1,942,495	1,942,495
Common stock, shares outstanding (in shares)	1,942,495	1,942,495
Building and Equipment [Member]
Accumulated depreciation	$ 73,374	$ 84,156