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Note 9 - Notes Payable and Capital Leases - Long-term Debt (Details) (Parentheticals) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
4% Subordinated Notes [Member] |  |
Stated Rate | 4.00% | 4.00%
Conversion of debt, original balance | $ 600,000 |
Conversion of debt, shares issued (in shares) | 181,000 |
Note Payable at 11.75% [Member] | Flexo Universal [Member] |  |
Stated Rate | 11.75% | 11.75%
Maturty date | Dec. 31, 2021 | Dec. 31, 2021
Term Loan [Member] | PNC [Member] |  |
Stated Rate | 8.25% | 8.25%
Periodic Payment | $ 100,000 | $ 100,000
Amortization period (Year) | 5 years | 5 years

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