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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Mar. 31, 2017
Asset Impairment Charges		$ 0	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		85,000	855,000
Allocated Share-based Compensation Expense		$ 296,000	$ 190,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		34.00%	34.00%
Research and Development Expense		$ 0	$ 0
Advertising Expense		46,000	$ 39,000
Additional Paid-in Capital [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption		(866,000)
Accounting Standards Update 2016-01 [Member] \| Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption		$ 458,000
Accounting Standards Update 2016-09 [Member] \| Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption				$ 866,000
Accounting Standards Update 2016-09 [Member] \| Additional Paid-in Capital [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption				$ (866,000)
Scenario, Forecast [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life		5 years
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life		17 years