Note 11 - Related Party Transactions (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Chief Executive Officer [Member]
Salary and Wage, Excluding Cost of Good and Service Sold, Total	$ 213,000	$ 200,000	$ 188,000
Cash Bonus	150,000	150,000	113,000
Allocated Share-based Compensation Expense, Total			50,000
Other Labor-related Expenses	49,000	41,000	30,000
Employee-related Liabilities, Total	13,000	13,000
Change in Excess of Bonus or Salary	50,000
Test Products International Inc. [Member]
Notes Receivable, Related Parties, Current	300,000
IED, Inc [Member] | Convertible Debt [Member]
Debt Instrument, Periodic Payment, Total	$ 300,000	$ 300,000	$ 300,000