Note 6 - Revenue Recognition - Revenue by Geographic Region (Details) - USD ($)		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Net Sales		$ 3,626,177	$ 3,657,978	$ 7,518,535	$ 7,088,846
UNITED STATES
Net Sales	[1]	2,353,952	2,773,242	5,433,846	5,444,629
Non-US [Member]
Net Sales		$ 1,272,225	$ 884,736	$ 2,084,689	$ 1,644,217

[1] Since substantially all purchases by ASI are shipped to ASI’s warehouses in the U.S., all sales to ASI are reported as U.S. sales for financial reporting purposes, even though a significant quantity of those purchases will be shipped by ASI to foreign customers. ASI has reported to the Company that approximately 75% of its sales of the Company’s products in the second quarter of 2022 were to foreign customers, with China representing approximately 46%. For the same time period in 2021, approximately 72% of ASI’s sales of the Company’s products were to foreign customers, with China representing approximately 43%.