Note 14 - Related Party Transactions (Details Textual) - Stellartech Research Corporation [Member]		3 Months Ended		160 Months Ended
	Jun. 01, 2006	Mar. 31, 2022 USD ($) shares	Mar. 31, 2021 USD ($)	Sep. 30, 2019	Dec. 31, 2021 USD ($)
Stock Issued During Period, Shares, New Issues (in shares) | shares		38
Related Party Transaction, Amounts of Transaction		$ 0	$ 77,000
Due to Related Parties, Total		$ 0			$ 0
Electricity, Generation [Member]
Development and Manufacturing Agreement, Number of Units	300
Development and Manufacturing Agreement, Number of Units Purchased				855