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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019	Mar. 31, 2017
Asset Impairment Charges, Total	$ 0	$ 0
Cumulative Effect of New Accounting Principle in Period of Adoption
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	349,750	85,000
Allocated Share-based Compensation Expense, Total	$ 432,000	$ 296,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	35.00%
Advertising Expense	$ 32,000	$ 46,000
Assets, Total	34,255,000	34,124,000
Liabilities, Total	2,061,000	2,801,000
Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	(458,000)	866,000
Additional Paid-in Capital [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption		$ (866,000)
Accounting Standards Update 2014-09 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	0
Accounting Standards Update 2016-01 [Member] \| Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 458,000
Accounting Standards Update 2018-11 [Member] \| Subsequent Event [Member]
Assets, Total			$ 3,500,000
Liabilities, Total			$ 4,179,000
Accounting Standards Update 2016-09 [Member] \| Additional Paid-in Capital [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption				$ (866,000)
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life	5 years
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life	17 years