Consolidated Balance Sheets Statement (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current assets
Cash and cash equivalents	$ 2,389	$ 3,986
Restricted cash	666	170
Available-for-sale investments, at quoted market value (cost of $2,276 and $3,142 at March 31, 2014 and December 31, 2013, respectively)	3,041	3,535
Accounts receivable – trade, net	1,767	1,414
Inventories, net	3,903	3,816
Deferred cost of goods sold	136	849
Prepaid expenses and other current assets	499	926
Total current assets	12,401	14,696
Property and equipment, net	903	941
Intangible and other assets, net	421	432
Total assets	13,725	16,069
Current liabilities
Current portion of capital lease obligation	5	8
Revolving lines of credit	479	583
Current portion of term loan	762	753
Accounts payable	3,033	2,323
Accrued liabilities	2,127	2,336
Advances on contracts in progress	1,525	1,433
Deferred compensation	3,041	3,535
Liabilities of discontinued operations	21	21
Total current liabilities	10,993	10,992
Long-term portion of term loan	4,870	5,064
Other long-term liabilities	899	726
Total long-term liabilities	5,769	5,790
Total liabilities	16,762	16,782
Stockholders’ deficit
Common stock, $0.01 par value; 20,000,000 shares authorized; 9,207,874 shares issued and outstanding on March 31, 2014 and December 31, 2013	93	93
Additional paid-in capital	23,275	23,267
Accumulated deficit	(27,544)	(24,422)
Accumulated other comprehensive income	765	393
Total Spire Corporation stockholders' deficit	(3,411)	(669)
Noncontrolling interest	374	(44)
Total stockholders’ deficit	(3,037)	(713)
Total liabilities and stockholders’ deficit	$ 13,725	$ 16,069