Statutory Accounting Practices (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statutory Accounting Practices [Line Items]
Net realized investment gains	$ 234,000	$ 998,000
NSIC
Statutory Accounting Practices [Line Items]
Statutory Accounting Practices, Statutory Net Income Amount	1,554,000	1,709,000
Tier One Risk Based Capital	15,689,000	15,144,000
Net realized investment gains	71,000	274,000
Asset Valuation Reserve	841,000	1,037,000
NSFC
Statutory Accounting Practices [Line Items]
Statutory Accounting Practices, Statutory Net Income Amount	(921,000)	2,060,000
Tier One Risk Based Capital	34,188,000	35,242,000
Net realized investment gains	114,000	254,000
Investment in Omega One	7,482	7,222
Omega
Statutory Accounting Practices [Line Items]
Statutory Accounting Practices, Statutory Net Income Amount	34,000	225,000
Tier One Risk Based Capital	10,983,000	10,719,000
Net realized investment gains	$ 49,000	$ 471,000