Note 9 - Notes Payable - Notes Payable (Details) (Parentheticals) - Notes Payable [Member] - USD ($)	Dec. 31, 2020	Jun. 04, 2020	Apr. 10, 2020	Dec. 31, 2019	Jul. 01, 2016
Related Party Notes, One [Member] | First Francis [Member]
Notes payable, face value	$ 2,000,000			$ 2,000,000	$ 2,000,000
Related Party Notes, Two [Member] | First Francis [Member]
Notes payable, face value	2,768,662			2,768,662	$ 2,768,662
Paycheck Protection Program CARES Act [Member]
Notes payable, face value			$ 3,679,383
Paycheck Protection Program CARES Act [Member] | Federal Hose [Member]
Notes payable, face value	253,071	$ 253,071
Paycheck Protection Program CARES Act [Member] | CAD Enterprises, Inc. [Member]
Notes payable, face value	1,200,766	$ 1,200,766
Seller Note [Member]
Notes payable, face value	$ 9,000,000			$ 9,000,000