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Note 4 - Debt (Details Textual) - USD ($)		3 Months Ended		12 Months Ended
Note 4 - Debt (Details Textual) - USD ($)	Jan. 01, 2019	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Apr. 23, 2021	Dec. 31, 2018	Dec. 31, 2017
Due to Related Parties, Noncurrent, Total		$ 1,140,709		$ 1,123,769
Share Price (in dollars per share)	$ 3.32
Flexo Universal [Member]
Long-term Debt, Total				1,800,000
Line of Credit [Member] \| Flexo Universal [Member]
Extinguishment of Debt, Amount				260,000
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
John H Schwan [Member]
Due to Related Parties, Total		1,140,709		1,123,769
Promissory Note [Member] \| John H Schwan [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		$ 17,000	$ 15,000
Three Lines of Credit [Member] \| Flexo Universal [Member]
Long-term Line of Credit, Total				$ 260,000
PNC [Member] \| PNC Agreements [Member]
Debt Instrument, Interest Rate, Increase (Decrease)		4.00%
PNC [Member] \| PNC Agreements [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity								$ 18,000,000
PNC [Member] \| PNC Agreements [Member] \| Subsequent Event [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity						$ 9,000,000
PNC [Member] \| PNC Agreements [Member] \| Term Loan [Member] \| Subsequent Event [Member]
Debt Instrument, Face Amount						6,000,000
Long-term Debt, Total						$ 2,000,000