Investments In Associated Organizations (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Schedule of Cost-method Investments [Line Items]
Total investments in associated organizations	$ 8,980,410	$ 9,349,311
NRUCFC Capital Term Certificates [Member]
Schedule of Cost-method Investments [Line Items]
Total investments in associated organizations	6,095,980	6,095,980
CoBank [Member]
Schedule of Cost-method Investments [Line Items]
Total investments in associated organizations	2,819,307	3,188,490
Other [Member]
Schedule of Cost-method Investments [Line Items]
Total investments in associated organizations	$ 65,123	$ 64,841