Note 10 - Stock Repurchase Program (Details Textual) - USD ($)	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015	Aug. 27, 2015	Jan. 21, 2009
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 Repurchased and Retired During Period, Value	$ 0	$ 1,695,788	$ 0
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