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Note 12 - Stockholders' Equity - Balances and Conversion of Preferred Shares and Accrued Dividends (Details) - USD ($)	1 Months Ended					3 Months Ended
	May 31, 2018	Apr. 30, 2018	Mar. 31, 2018	Oct. 31, 2017	Sep. 30, 2017	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2016
Series A-1 Convertible Preferred Stock [Member]
Balance (in shares)								62,596					90,000
Conversion into common stock (in shares)	(23,508)	(39,088)		(27,404)
Balance								$ 236,658					$ 270,000
Accrual of dividends						$ 25,463	$ 93,894	$ 101,658	$ 135,000	$ 135,000	$ 135,000
Conversion into common stock	$ (25,463)	$ (330,552)			$ (540,000)
Series B-1 Convertible Preferred Stock [Member]
Balance (in shares)								105,000					105,000
Conversion into common stock (in shares)	(44,580)		(60,420)
Balance								$ 393,750					$ 131,250
Accrual of dividends						$ 16,408	$ 62,268	$ 65,625	$ 65,625	$ 65,625	$ 65,625
Conversion into common stock	$ (55,342)		$ (417,084)

X

- Definition

The value of the dividends payable that are converted in a noncash (or part noncash) transaction.

+ References

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The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding.

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Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK).

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Number of shares issued which are neither cancelled nor held in the treasury.

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