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Note 9 - Shareholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands					3 Months Ended	26 Months Ended	38 Months Ended
	Apr. 01, 2018	Oct. 10, 2017	Jan. 01, 2017	Oct. 27, 2014	Mar. 31, 2018	Dec. 31, 2016	Dec. 31, 2017	Jan. 01, 2018	Sep. 30, 2017	Apr. 29, 2017	Jan. 07, 2015
Warrants Exercisable Term					180 days
Warrants Term					5 years
Michael Taglich [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights					156,912			6,000
Guaranty Agreement, Out of Formula Borrowings Available, Maximum					$ 1,500
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right											30,000
Class of Warrant or Right, Exercise Price of Warrants or Rights								$ 20
Placement Agent Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights					227,655
Individual Investors [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights					317,938
Warrants Issued as Consideration for Loan [Member]
Warrants Term		8 years
Class of Warrant or Right, Number of Securities Called by Warrants or Rights		66,315			66,315
Class of Warrant or Right, Exercise Price of Warrants or Rights		$ 2.65
Purchaser Warrant [Member] \| Private Placement [Member] \| Roger Kahn [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights					8,600
Warrants Issued in Connection with Credit Facility with Heritage Bank [Member] \| Michael Taglich [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights					86,000
The 2016 Stock Incentive Plan [Member]
Common Stock, Capital Shares Reserved for Future Issuance										500,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance					462,846
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant					258,334
Convertible Preferred Stock Converted to Common Stock [Member]
Conversion of Stock, Shares Converted							1,636
Conversion of Stock, Shares Issued							1,007
Series A Convertible Preferred Stock [Member]
Stock Issued During Period, Shares, New Issues				200,000
Share Price				$ 10
Gross Proceeds From Sale of Stock				$ 2,000
Preferred Stock Conversion Price				$ 16.25
Minimum Common Stock Price Allowing Company to Force Convert Preferred Stock				$ 32.50
Preferred Stock, Dividend Rate, Percentage			12.00%			6.00%
Preferred Stock Dividends, Shares, Maximum Cumulative									64,000
Convertible Preferred Stock [Member]
Preferred Stock Dividends, Shares					58,494
Convertible Preferred Stock [Member] \| Subsequent Event [Member]
Preferred Stock, Dividend Rate, Percentage	12.00%
Preferred Stock Dividends, Shares	3,870
Dividends, Preferred Stock, Cash	$ 38