Note 3 - Contracts in Progress (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Contract with Customer, Cumulative Catch-up Adjustment to Revenue, Change in Estimate of Transaction Price and Input Costs	$ (14,000)	$ 22,000
Increase (Decrease) in Contract with Customer, Asset	(7,039,227)	5,800,506
Increase (Decrease) in Contract with Customer, Liability	$ 70,211	$ (4,796,025)