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Note 15 - Subsequent Events (Details Textual) - Subsequent Event [Member] - USD ($) $ in Thousands | Oct. 28, 2021 | Oct. 15, 2021 | Oct. 06, 2021
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October 2021 Agreement [Member] | M&T Bank [Member] |  |  |
Debt Instrument, Term (Year) |  | 5 years |
Debt Instrument, Interest Rate in Event of Default |  | 2.00% |
October 2021 Agreement [Member] | M&T Bank [Member] | Revolving Credit Facility [Member] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 10,000 |
October 2021 Agreement [Member] | M&T Bank [Member] | Term Note [Member] |  |  |
Debt Instrument, Face Amount |  | $ 25,000 |
Debt Instrument, Draw Period (Year) |  | 2 years |
Debt Instrument, Interest Rate, Stated Percentage |  | 2.20% |
Proceeds from Issuance of Long-term Debt, Total | $ 12,000 |  |
Debt Instrument, Interest Rate, Effective Percentage | 3.20% |  |
Z-Sciences [Member] |  |  |
Payments to Acquire Businesses, Gross |  |  | $ 500
Business Combination, Consideration Transferred, Amount Held in Escrow |  |  | $ 200
Videology [Member] |  |  |
Payments to Acquire Businesses, Gross | $ 12,000 |  |
Business Combination, Consideration Transferred, Amount Held in Escrow | $ 1,200 |  |

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