Note 4 - Revenue Disaggregation - Costs, Estimated Earnings, and Billings on Uncompleted Contracts (Details)	Mar. 31, 2022 USD ($)
Costs incurred on contracts in progress	$ 6,878,958
Estimated earnings	4,792,589
Costs and Estimated Earnings on Uncompleted Contracts	11,671,547
Billings to date	(9,510,318)
Net Cost in Excess of Billings	2,161,229
Deferred revenue related to non-systems contracts	(163,791)
Contract Liability In Excess of Contract Assets	1,997,438
Included in accompanying balance sheets
Contract assets	2,717,823
Contract liabilities	$ (720,385)