Significant accounting policies (Details) (USD $)	3 Months Ended	12 Months Ended
Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Cash, cash equivalents and short term investments:
Cash and cash equivalent investment portfolio, percentage	24.00%
Percentage of any single short-term security held in investment portfolio, maximum	5.00%
Cumulative amount of realized loss on investments to date has not exceeded	$ 5,000
Unrealized gain (loss) on marketable investments	(38,869)	1,260
Management fees, marketable securities	$ 3,893	$ 657
Income (loss) per share:
Shares not included in the computation of EPS	1,774,000	2,862,000
Reverse stock split ratio			6
Weighted average number of shares outstanding basic and diluted, pre-split		9,633,321
Weighted average number of shares outstanding basic and diluted, post-split		1,608,146

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The cumulative amount of realized loss from investments as to date.

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Fees related to the management of the marketable securities held in investment portfolio.

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The maximum percentage of any single held short term security within the entity's investment portfolio.

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The percentage of cash and cash equivalents investments held within the entity's investment portfolio.

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Conversion ratio of a reverse stock split where a specific number of shares are converted into a single share of common stock.

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The average number of shares or units issued and outstanding that are used in calculating basic and diluted EPS.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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The aggregate net change in the difference between the fair value and the carrying value, or in the comparative fair values, of marketable securities categorized as trading held at each balance sheet date, that was included in earnings for the period, which may have arisen from (a) securities classified as trading, (b) the unrealized holding gain (loss) on held-to-maturity securities transferred to the trading security category, and (c) the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) on available-for-sale securities transferred to trading securities during the period.

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Change in number of shares issued and outstanding as a result of capital structure change to a stock dividend, stock split or reserve split occurring after the balance sheet date but prior to the later of the issuance of financial statements or the effective date of registration statement.

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