Note 4 - Uncompleted Contracts (Details) - Costs and estimated earnings in excess of billings on uncompleted contracts (USD $)	Jun. 30, 2013	Dec. 31, 2012
Costs and estimated earnings in excess of billings on uncompleted contracts [Abstract]
Costs incurred on uncompleted contracts	$ 11,543,541	$ 10,733,663
Estimated earnings	10,483,382	9,465,412
	22,026,923	20,199,075
Billings to date	(17,778,113)	(17,944,876)
	4,248,810	2,254,199
Included in accompanying balance sheets under the following captions:
Costs and estimated earnings in excess of billings on uncompleted contracts	4,294,356	2,730,104
Billings in excess of costs and estimated earnings on uncompleted contracts	$ (45,546)	$ (475,905)