Note 9 - Commitments and Contingencies (Details Textual)			12 Months Ended
	Oct. 01, 2019 USD ($) shares	May 14, 2019 USD ($) shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($) shares
Accrued Royalty and License Fees, Current			$ 9,000	$ 3,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares			0	0	0
Surety Bond Guarantee			$ 4,600,000
Project Guarantee, Percent of Project Completed			90.00%
William J. Clough [Member]
Employment Agreements, Severance Package, Term		3 years
Annual Salary, Year One		$ 750,000
Annual Salary, Year Two		800,000
Annual Salary, Year Three		$ 850,000
Employment Agreements, Maximum Percent of Salary for Performance		75.00%
Employment Agreements, Maximum Discretionary Bonus, Percentage		25.00%
Employment Agreement, Stock Options Grants Subject to Approval | shares		1,600,000
Employment Agreement, Annual Life Insurance Premium		$ 9,999
Employment Agreement, Severance, Ratio of Annual Base Salary		2.5
Employment Agreement, Severance, Term of Medical Coverage		1 year 180 days
Workers' Compensation Liability			$ 0
Employment Agreements, Accrued Employee Compensation				$ 30,000	$ 33,000
Daniel N. Ford [Member]
Employment Agreements, Severance Package, Term		3 years
Annual Salary, Year One		$ 500,000
Annual Salary, Year Two		550,000
Annual Salary, Year Three		$ 600,000
Employment Agreements, Maximum Percent of Salary for Performance		75.00%
Employment Agreements, Maximum Discretionary Bonus, Percentage		25.00%
Employment Agreement, Stock Options Grants Subject to Approval | shares		960,000
Employment Agreement, Severance, Ratio of Annual Base Salary		2
Employment Agreement, Severance, Term of Medical Coverage		1 year 180 days
Employment Agreements, Accrued Employee Compensation			$ 0	$ 21,000	$ 22,000
James F. O'Neil III [Member]
Annual Salary, Year One	$ 750,000
Annual Salary, Year Two	800,000
Annual Salary, Year Three	$ 850,000
Employment Agreements, Maximum Percent of Salary for Performance	75.00%
Employment Agreements, Maximum Discretionary Bonus, Percentage	25.00%
Employment Agreement, Stock Options Grants Subject to Approval | shares	1,000,000
Employment Agreement, Annual Life Insurance Premium	$ 9,999
Employment Agreement, Severance, Ratio of Annual Base Salary	2.5
Employment Agreement, Severance, Term of Medical Coverage	1 year 180 days
Employment Agreements, Term	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares	600,000