Note 11 - Debt - Component of Debt (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020	Dec. 21, 2020	Apr. 30, 2020
Long term debt, principal	$ 297,415,000	$ 300,667,000
Carrying value	271,478,000	268,288,000
Long term debt, fair value	289,806,000	290,372,000
KWH Bank Loan [Member]
Long term debt, principal			$ 2,500,000
Paycheck Protection Program CARES Act [Member]
Long term debt, fair value				$ 2,900,000
Notes Payable to Banks [Member]
Long term debt, principal	22,613,000	25,700,000
Carrying value	22,276,000	25,303,000
Long term debt, fair value	25,046,000	25,893,000
Notes Payable to Banks [Member] | KWH Bank Loan [Member]
Long term debt, principal	22,613,000	25,700,000
Carrying value	22,276,000	25,303,000
Long term debt, fair value	25,046,000	25,893,000
Loans Payable [Member]
Long term debt, principal	184,302,000	184,467,000
Carrying value	189,601,000	192,057,000
Long term debt, fair value	205,159,000	213,551,000
Loans Payable [Member] | Mortgage [Member]
Long term debt, principal	163,066,000	166,106,000
Carrying value	170,009,000	173,696,000
Long term debt, fair value	182,621,000	194,158,000
Loans Payable [Member] | Additional Mortgage [Member]
Long term debt, principal	14,704,000	0
Carrying value	13,060	0
Long term debt, fair value	15,244	0
Loans Payable [Member] | Flower Note [Member]
Long term debt, principal	6,532,000	6,885,000
Carrying value	6,532,000	6,885,000
Long term debt, fair value	7,294,000	7,863,000
Loans Payable [Member] | Net Lease Note [Member]
Long term debt, principal	0	9,000,000
Carrying value	0	9,000,000
Long term debt, fair value	0	9,054,000
Loans Payable [Member] | Paycheck Protection Program CARES Act [Member]
Long term debt, principal	0	2,476,000
Carrying value	0	2,476,000
Long term debt, fair value	0	2,476,000
Subordinated Debt [Member]
Long term debt, principal	90,500,000	90,500,000
Carrying value	59,601,000	50,928,000
Long term debt, fair value	$ 59,601,000	$ 50,928,000