Note 10 - Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]

(Dollars in thousands)
Date of issuance	Type of issuance	Expense/ Prepaid/ Cash	Stock issuance recipient	Reason for issuance	Total no. of shares		Grant date fair value or net proceeds recorded at issuance
January, April, July and October 2018	Vested restricted common stock	Expense	Four board members	Director compensation		72,157	$	175
January and July 2018	Common stock	Expense	Three Employees	Approved bonuses		68,118		183	(1)
July and December 2018	Common stock	Expense	Related Party, James McKenzie	Pursuant to royalty agreement		5,755		14	(1)
Total 2018 issuances						146,030	$	372	(2) (3)
									(11)
January, April, August and October 2017	Vested restricted common stock	Expense	Four board members	Director compensation		49,980	$	200
January, February and June 2017	Common stock	Expense	Three Employees	Approved bonuses		28,634		182	(4)
January and December 2017	Common stock	Expense	Related party, James McKenzie	Pursuant to royalty agreement		3,293		16	(4)
January and February 2017	Common stock	Expense	Two Employees	Cashless stock option exercises		245		—	(5)
May 2017	Common stock	Prepaid expense/expense	Third-party consultant	Strategic investor marketing services		15,000		57	(6)
October 2017	Common stock	Cash	Various third-party shareholders	Equity raise		7,392,856		18,905
Total 2017 issuances						7,490,008	$	19,360	(7)
January, April, July and October 2016	Vested restricted common stock	Expense	Five board members	Director compensation		46,854	$	267	(8)
January and July 2016	Vested restricted common stock	Expense	Four Employees	Approved bonuses		56,782		381	(9)
January, March September and December 2016	Common stock	Expense	Related party, James McKenzie	Pursuant to royalty agreement		6,275		38
February and April 2016	Common stock	Expense	Three Employees	Cashless stock option exercise		718		—	(5)
Total 2016 issuances						110,629	$	686	(10)

Summary of Warrants and Options Issued [Table Text Block]

	For the Year Ended December 31, 2016
	Number of Options			Weighted Average Exercise Price ($)		Weighted Average Remaining Contract Life (years)	Aggregate Intrinsic Value ($ '000)
Balance at beginning of year		970,847		$	6.32	6.54	$	850
Exercised		(2,333	)		5.46			4
Expired		(1,833	)		5.40
Balance at end of year		966,681		$	6.32	5.55		751
Exercisable		966,681		$	6.32	5.55		751

	For the Year Ended December 31, 2017
	Number of Options			Weighted Average Exercise Price ($)		Weighted Average Remaining Contract Life (years)	Aggregate Intrinsic Value ($ '000)
Balance at beginning of year		966,681		$	6.32	5.55	$	751
Exercised		(2,001	)		5.70
Expired		(500	)		4.58
Balance at end of year		964,180		$	6.32	4.56		—
Exercisable		964,180		$	6.32	4.56		—

	For the Year Ended December 31, 2018
	Number of Options			Weighted Average Exercise Price ($)		Weighted Average Remaining Contract Life (years)	Aggregate Intrinsic Value ($ '000)
Balance at beginning of year		964,180		$	6.32	4.56	$	—
Expired		(40,282	)		6.47
Balance at end of year		923,898		$	6.32	3.64		—
Exercisable		923,898		$	6.32	3.64		—