Note 4 - Stockholders' Equity (Detail) - Summary of outstanding stock options under the Plan: (USD $)			3 Months Ended
Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Stock Options [Member]
Quantity	4,966,753	5,016,916	4,966,753
Quantity			4,690,253
Weighted-average exercise price (in Dollars per share)	$ 4.57	$ 4.54	$ 4.57
Weighted-average exercise price (in Dollars per share)			$ 4.65
Weighted Average Remaining Contractual Term (in Years)			7 years 25 days
Weighted Average Remaining Contractual Term (in Years)			6 years 354 days
Intrinsic value (in Dollars)			$ 370,896
Intrinsic value (in Dollars)			$ 330,671

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of options outstanding.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise prices of fully vested and expected to vest options outstanding.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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