Note 8 - Income Taxes - Components of Income Tax Expense (Benefit) from Continuing Operations (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Current income taxes:
Federal
State
Current tax (benefit)	(311,189)	(365,430)
Book in excess of tax depreciation	(61,808)	(40,231)
Allowance for doubful accounts	752
Work in progress	848,000
Net operating loss carryover	(344,870)	(729,928)
Valuation allowance	(507,935)	704,876
Deferred compensation	(6,508)	13,127
Accrued vacation	(2)	(949)
Reserve for obsolete inventory	86,308	53,105
Deferred tax expense (benefit)	13,937
Total tax expense (benefit)	(297,252)	(365,430)
Danish Ministry of Taxation [Member]
Current income taxes:
Danish	$ (311,189)	$ (365,430)