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Note 13 - Related Party Transactions (Details Textual) - USD ($)		12 Months Ended
	Jan. 11, 2019	Dec. 31, 2020	Dec. 31, 2019	Jul. 01, 2019	Dec. 31, 2018
Share Price (in dollars per share)	$ 3.32
Due from Related Parties, Current, Total		$ 100,000	$ 1,387,131
Conversion of Related Party Debt to Equity [Member]
Debt Conversion, Original Debt, Amount	$ 600,000
Debt Conversion, Converted Instrument, Shares Issued (in shares)	181,000
Schwan Incorporated [Member]
Related Party Transaction, Amounts of Transaction		13,000	16,000
John H Schwan [Member]
Due to Related Parties, Total		1,123,769	1,058,486
John H Schwan [Member] | Promissory Note [Member]
Due to Related Parties, Noncurrent, Total	$ 997,019				$ 1,600,000
Debt Instrument, Interest Rate, Stated Percentage	6.00%				6.00%
Repayments of Related Party Debt		0	0
Interest Expense, Related Party		65,000	61,000
CTI Europe [Member]
Long-term Debt, Gross		0	$ 14,000
Board of Directors Chairman [Member]
Due from Related Parties, Current, Total				$ 1,300,000
Note Receivable, Reserve		$ 1,277,000

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