CONSOLIDATED STATEMENTS OF ASSETS AND LIABILITIES (Parenthetical) (USD $)	Mar. 31, 2013		Mar. 31, 2012
Investments at market or fair value
Companies more than 25% owned, Cost	$ 13,711,000		$ 14,870,000
Companies 5% to 25% owned, Cost	15,594,000		14,003,000
Companies less than 5% owned, Cost	58,961,000		60,120,000
Total investments, Cost	$ 88,265,649	[1],[2]	$ 88,992,822	[1],[2]
Net Assets
Common stock, par value (in dollars per share)	$ 1		$ 1
Common stock, authorized (in shares)	5,000,000		5,000,000
Common stock, issued (in shares)	4,394,194		4,339,416
Treasury stock, at cost (in shares)	584,878		584,878
Net asset value per share (in shares)	3,809,316		3,754,538

[1] Agreements between certain issuers and the Company provide that the issuer will bear substantially all costs in connection with the Company disposing such common stock, including those costs involved in registration under the Securities Act of 1933, but excluding underwriting discounts and commissions. These agreements cover common stock owned at March 31, 2013 and common stock which may be acquired thereafter through the exercise of warrants and conversion of debentures and preferred stock. They apply to restricted securities of all issuers in the investment portfolio of the Company except securities of the following issuers which are not obligated to bear registration costs: Humac Company and The Whitmore Manufacturing Company.

[2] The descriptions of the companies and ownership percentages shown in the Consolidated Schedule of Investments were obtained from published reports and other sources believed to be reliable. Acquisition dates indicated are the dates specific securities were acquired, which may differ from the original investment dates. Certain securities were received in exchange for or upon conversion or exercise of other securities previously acquired.