Note 10 - Stock Repurchase Program (Details Textual) - USD ($)	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014	Aug. 27, 2015	Jan. 21, 2009
Stock Repurchased and Retired During Period, Value	$ 1,695,788	$ 0	$ 1,263,405
Common Stock, Shares Authorized	6,000,000	6,000,000
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Capital Units, Authorized	10,000,000
Stock Repurchase Program, Authorized Amount					$ 2,500,000
Stock Repurchase Program Authorized Additional Amount				$ 5,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 4,540,806