Note 6 - Stock-based Compensation (Details) - Summary of Stock Option Activity - $ / shares	6 Months Ended
Jun. 30, 2015	Jun. 30, 2014
Stock options - common:
Outstanding - beginning of period	274,746	274,746
Outstanding - beginning of period	$ 1.99	$ 1.99
Options granted	0	0
Options granted	$ 0	$ 0
Options exercised	0	0
Options exercised	$ 0	$ 0
Options expired	0	0
Options expired	$ 0	$ 0
Options forfeited	0	0
Options forfeited	$ 0	$ 0
Options outstanding - end of period	274,746	274,746
Options outstanding - end of period	$ 1.99	$ 1.99
Exercisable at end of period	206,064	137,376
Exercisable at end of period	$ 1.99	$ 1.99

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-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 price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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