Note 18 - Warrant Liabilities (Details Textual) - $ / shares	Sep. 25, 2019	Jan. 17, 2018
Investor Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights		645,000
Class of Warrant or Right, Exercise Price of Warrants or Rights		$ 6.60
Placement Agent Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights		129,000
Class of Warrant or Right, Exercise Price of Warrants or Rights		$ 6.60
Warrants Issued January 17, 2018 Containing Full Ratchet Price Protection [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 1.4927
Private Placement [Member]
Stock Issued During Period, Shares, New Issues	1,608,430	2,150,001
Shares Issued, Price Per Share	$ 1.4927	$ 5.15