Statutory Accounting Practices (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Statutory Accounting Practices [Line Items]
Net realized investment gains	$ 998,000	$ 503,000
NSIC [Member]
Statutory Accounting Practices [Line Items]
Statutory Accounting Practices, Statutory Net Income Amount	1,488,000	1,488,000
Tier One Risk Based Capital	13,872,000	13,872,000
Net realized investment gains	313,000	455,000
Asset Valuation Reserve	820,000	832,000
NSFC [Member]
Statutory Accounting Practices [Line Items]
Statutory Accounting Practices, Statutory Net Income Amount	2,060,000	2,988,000
Tier One Risk Based Capital	35,242,000	34,446,000
Net realized investment gains	166,000	(477,000)
Investment in Omega One	7,189	6,364
Omega [Member]
Statutory Accounting Practices [Line Items]
Statutory Accounting Practices, Statutory Net Income Amount	225,000	771,000
Tier One Risk Based Capital	10,719,000	10,689,000
Net realized investment gains	$ 24,000	$ 120,000