Note 7 - Equity and Stock-based Compensation (Details Textual)			3 Months Ended	9 Months Ended
	May 28, 2018 USD ($) shares	May 05, 2016 USD ($) $ / shares shares	Jun. 30, 2018 shares	Sep. 30, 2019 USD ($) $ / shares shares	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($) $ / shares shares	Sep. 17, 2018 $ / shares shares	Aug. 04, 2016 shares
Authorized Shares, Common and Preferred				101,000,000
Common Stock, Shares Authorized				100,000,000		100,000,000
Preferred Stock, Shares Authorized				1,000,000		1,000,000
Preferred Stock, Par or Stated Value Per Share | $ / shares				$ 0.0001		$ 0.0001
Stock Issued During Period, Shares, New Issues	1,000,000
Preferred Stock, Liquidation Preference, Value | $				$ 29,038,000		$ 29,038,000
Proceeds from Issuance of Common Stock | $	$ 500,000				$ 500,000
Issuance of Options to Settle Accrued Compensation Liabilities | $					$ 321,250
The 2016 Omnibus Plan [Member]
Evergreen Provision, Increase in Number of Shares Authorized Calculation, Percentage Amount of Prior Year's Reserved Shares								6.00%
Evergreen Provision, Maximum Limit of Increase to Authorized Shares								1,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized				1,786,524
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross				125,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value | $				$ 2,600
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period				0
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $				$ 0
Warrants Issued to Investors [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights							466,666
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares							$ 0.15
Common Stock [Member]
Stock Issued During Period, Shares, New Issues			1,000,000
Class of Warrant or Right, Number of Securities Called by Warrants or Rights		6,180,000
Additional Paid-in Capital [Member] | The 2016 Omnibus Plan [Member]
Issuance of Options to Settle Accrued Compensation Liabilities | $				$ 50,000
Maximum [Member] | Common Stock [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares		$ 0.75
Minimum [Member] | Common Stock [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares		$ 0.50
Series A Preferred Stock [Member]
Preferred Stock, Shares Authorized		29,038
Preferred Stock, Par or Stated Value Per Share | $ / shares		$ 0.0001
Stock Issued During Period, Shares, New Issues		29,038
Preferred Stock, Liquidation Preference, Value | $		$ 29,038,000
Preferred Stock, Voting Rights, Number of Votes Per Share		5
Preferred Stock, Restrictions, Debt Ceiling Other Than for Working Capital Purposes | $		$ 3,000,000
Series A Preferred Stock [Member] | Maximum [Member]
Preferred Stock, Voting Rights, Percentage of Voting Rights of Capital Stock		1.00%