Note 17 - Acquisitions (Details Textual) - USD ($)	Mar. 07, 2022	Mar. 31, 2022	Dec. 31, 2021
Goodwill, Ending Balance		$ 102,349,000	$ 100,899,000
GTS Subsidiary [Member] | Coax Fiber Solutions (CFS) [Member]
Payments to Acquire Businesses, Gross	$ 800,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares)	125,000
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	$ 250,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Total	400,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment, Total	500,000
Goodwill, Ending Balance	1,400,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities, Total	$ 1,300,000