Note 8 - Income Taxes - Summary of Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Stock based compensation	$ 44,000	$ 50,000
Goodwill and intangibles	3,000	21,000
Property and equipment	471,000	486,000
Total deferred tax assets	518,000	557,000
Valuation Allowance	(42,000)	(50,000)
Deferred tax asset – net of valuation allowance	476,000	507,000
Change in valuation allowance	$ 8,000