Note 8 - Stock Warrants (Details) - Schedule of Stockholders' Equity Note, Warrants or Rights - $ / shares	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Schedule of Stockholders' Equity Note, Warrants or Rights [Abstract]
Warrants, Outstanding		142,653
Warrants, Outstanding Weighted-Average Exercise Price	$ 17.42	$ 17.42
Warrants, Outstanding Weighted-Average Remaining Contractual Terms	1 year	1 year 3 months
Warrants, Exercisable	142,653
Warrants, Exercisable Weighted-Average Exercise Price	$ 17.42
Warrants, Exercisable Weighted-Average Remaining Contractual Terms	1 year
Warrants, Granted	0
Warrants, Granted Weighted-Average Exercise Price	$ 0
Warrants, Expired	0
Warrants, Expired Weighted-Average Exercise Price	$ 0
Warrants, Outstanding	142,653