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Note 10 - Stockholders' Equity (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	May 31, 2017
The 2009 Distributor Stock Purchase Plan [Member]
Class of Warrant or Right, Outstanding	2,371
Maximum [Member] \| The 2009 Distributor Stock Purchase Plan [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 4.77
Minimum [Member] \| The 2009 Distributor Stock Purchase Plan [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 4.24
The 2014 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	142,857
Share-based Payment Arrangement, Expense	$ 19,000	$ 21,000
Share-based Payment Arrangement, Expense, after Tax	19,000	21,000
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	$ 0
The 2014 Stock Incentive Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	10 years
The 2017 Incentive Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized			200,000
The 2009 Distributor Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	0
The 2009 Distributor Stock Purchase Plan [Member] \| Warrants [Member]
Share-based Payment Arrangement, Expense	$ 2,000	$ 3,600
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding	$ 0