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Equity Incentive Plans (Narrative) (Details) - USD ($)				6 Months Ended
	Apr. 26, 2021	Feb. 19, 2021	Feb. 10, 2021	Jun. 30, 2021	Jun. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Options granted				72,800
Shares underlying unexercised options				387,300
Expected future compensation expense, unexercised options				$ 677,000
Options [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected future compensation expense, weighted average period for recognition				4 years 10 months 20 days
Restricted Stock [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected future expenses relating to non-vested restricted shares				$ 288,000
Expected future compensation expense, weighted average period for recognition				3 years 7 months 2 days
2018 Equity Incentive Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Shares authorized for issuance				1,000,000
2011 Stock Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Shares authorized for issuance				900,000
Directors [Member] | 2018 Equity Incentive Plan [Member] | Options [Member]
Defined Benefit Plan Disclosure [Line Items]
Options granted			66,000
Vesting period			5 years
Directors [Member] | 2018 Equity Incentive Plan [Member] | Restricted Stock [Member]
Defined Benefit Plan Disclosure [Line Items]
Restricted stock issued		300	26,400
Vesting period		2 years	4 years
Certain Officers [Member]
Defined Benefit Plan Disclosure [Line Items]
Options granted	6,800
Vesting period	5 years

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