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16. Oil and Gas Reserve Data - Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Reserves: (Details) - USD ($)
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Extractive Industries [Abstract]        
Future cash inflows $ 72,238,000 $ 70,252,000 $ 52,900,000  
Future production costs and taxes (19,569,000) (20,647,000) (14,893,000)  
Future development costs (6,617,000) (4,826,000) (4,850,000)  
Future income taxes (9,254,000) (9,801,000) (6,374,000)  
Future net cash flows 36,798,000 34,978,000 26,783,000  
Annual 10% discount for estimated timing of cash flows (17,860,000) (15,649,000) (12,414,000)  
Standardized measure of discounted future net cash flows $ 18,938,000 $ 19,329,000 $ 14,369,000 $ 19,356,000