CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Preferred Stock Convertible	Common Stock	Additional Paid-In Capital	Retained Earnings	Other Comprehensive Gain (Loss)	Total
Balance at Mar. 31, 2013	$ 9	$ 20		$ 63,987	$ (2)	$ 64,014
Balance (in shares) at Mar. 31, 2013	3	20,109
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of restricted stock, net
Issuance of restricted stock, net (in shares)		81
Share based compensation			$ 1,479			$ 1,479
Dividends declared				(13,312)		(13,312)
Deferred tax adjustment related to restricted stock			99			99
Net income				17,972	17,972	17,972
Other comprehensive gain (loss):
Net Change in unrealized loss on short term investments						(35)
Total comprehensive income					17,937	17,937
Balance at Mar. 31, 2014	$ 9	$ 20	1,578	68,647	(37)	$ 70,217
Balance (in shares) at Mar. 31, 2014	3	20,190
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of restricted stock, net
Issuance of restricted stock, net (in shares)		72
Share based compensation			1,481			$ 1,481
Dividends declared				(13,757)		(13,757)
Deferred tax adjustment related to restricted stock			58			58
Net income				17,453	17,453	17,453
Other comprehensive gain (loss):
Net Change in unrealized loss on short term investments						(17)
Total comprehensive income					17,436	17,436
Balance at Mar. 31, 2015	$ 9	$ 20	3,117	72,343	(54)	$ 75,435
Balance (in shares) at Mar. 31, 2015	3	20,262
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of restricted stock, net
Issuance of restricted stock, net (in shares)		185
Share based compensation			1,612			$ 1,612
Dividends declared				(14,615)		(14,615)
Deferred tax adjustment related to restricted stock			142			142
Net income				20,567	20,567	20,567
Other comprehensive gain (loss):
Net Change in unrealized loss on short term investments						54
Total comprehensive income					$ 20,621	20,621
Balance at Mar. 31, 2016	$ 9	$ 20	$ 4,871	$ 78,295		$ 83,195
Balance (in shares) at Mar. 31, 2016	3	20,447