Note 3 - Revenue - Costs, Estimated Earnings, and Billings on Uncompleted Contracts (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020	Jan. 01, 2020
Costs incurred on contracts in progress	$ 7,418,433	$ 4,464,471
Estimated earnings	5,071,039	2,087,396
Costs and Estimated Earnings on Uncompleted Contracts	12,489,472	6,551,867
Billings to date	(11,408,605)	(6,212,229)
Net Cost in Excess of Billings	1,080,867	339,638
Deferred revenue related to non-systems contracts	(192,920)	(632,014)
Contract Liability In Excess of Contract Assets	887,947	(292,376)
Included in accompanying balance sheets
Contract assets	2,538,373	494,281	$ 500,000
Contract liabilities	$ (1,650,426)	$ (786,657)