Balance Sheets (Parentheticals) - USD ($)	Mar. 31, 2016	Mar. 31, 2015
Allowance for uncollectible accounts	$ 15,000	$ 15,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	6,000,000	6,000,000
Common stock, shares issued (in shares)	4,835,010	4,857,953
Common stock, shares outstanding (in shares)	4,835,010	4,857,953