Quarterly report pursuant to Section 13 or 15(d)

Note 2 - Revenue From Contracts With Customers - Changes in Contract Assets and Liabilities (Details)

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Note 2 - Revenue From Contracts With Customers - Changes in Contract Assets and Liabilities (Details) - USD ($)
3 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Contract assets, balance $ 477,268 $ 342,611 $ 210,688 $ 13,918 $ 0 $ 0
Contract assets added 45,895 134,657 131,923 75,486 13,918  
Reduction in contract assets (523,163)          
Contract assets, balance 0 477,268 342,611 89,404 13,918 0
Contract liabilities, balance 105,884 455,496 946,884 64,344 270,791 464,223
Contract liabilities added 79,640 4,815 93,934 480,024 9,906 19,136
Revenue recognized (107,479) (354,427) (585,322) (212,719) (216,353) (212,568)
Contract liabilities, balance $ 78,045 $ 105,884 $ 455,496 $ 331,649 $ 64,344 $ 270,791